diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 27e89480d9..5b98a8ba20 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -134,6 +134,7 @@ jobs:
       - run: ccache -s
       - run: ../tests/basic.sh out/Release/naive
       - run: mkdir ${{ env.BUNDLE }} && cp out/Release/naive config.json ../LICENSE ../USAGE.txt ${{ env.BUNDLE }}
+      - run: cp out/Release/libcronet.* components/cronet/native/generated/cronet.idl_c.h components/cronet/native/include/*.h components/grpc_support/include/*.h components/cronet/native/sample/bidi_example.cc ${{ env.BUNDLE }}
       - run: tar cJf ../${{ env.BUNDLE }}.tar.xz ${{ env.BUNDLE }}
       - uses: actions/upload-release-asset@v1
         if: ${{ github.event_name == 'release' }}
@@ -204,6 +205,7 @@ jobs:
         # qemu-user segfaults with x64 or x86 android builds here.
         if: ${{ matrix.arch != 'x64' && matrix.arch != 'x86' }}
       - run: mkdir ${{ env.BUNDLE }} && cp out/Release/naive config.json ../LICENSE ../USAGE.txt ${{ env.BUNDLE }}
+      - run: cp out/Release/libcronet.* components/cronet/native/generated/cronet.idl_c.h components/cronet/native/include/*.h components/grpc_support/include/*.h components/cronet/native/sample/bidi_example.cc ${{ env.BUNDLE }}
       - run: tar cJf ../${{ env.BUNDLE }}.tar.xz ${{ env.BUNDLE }}
       - uses: actions/upload-release-asset@v1
         if: ${{ github.event_name == 'release' }}
@@ -269,6 +271,7 @@ jobs:
         # No real or emulated environment is available to test this.
         if: ${{ matrix.arch != 'arm64' }}
       - run: mkdir ${{ env.BUNDLE }} && cp out/Release/naive.exe config.json ../LICENSE ../USAGE.txt ${{ env.BUNDLE }}
+      - run: cp out/Release/libcronet.* components/cronet/native/generated/cronet.idl_c.h components/cronet/native/include/*.h components/grpc_support/include/*.h components/cronet/native/sample/bidi_example.cc ${{ env.BUNDLE }}
       - run: 7z a ../${{ env.BUNDLE }}.zip ${{ env.BUNDLE }}
       - uses: actions/upload-release-asset@v1
         if: ${{ github.event_name == 'release' }}
@@ -323,6 +326,7 @@ jobs:
         # No real or emulated environment is available to test this.
         if: ${{ matrix.arch != 'arm64' }}
       - run: mkdir ${{ env.BUNDLE }} && cp out/Release/naive config.json ../LICENSE ../USAGE.txt ${{ env.BUNDLE }}
+      - run: cp out/Release/libcronet.* components/cronet/native/generated/cronet.idl_c.h components/cronet/native/include/*.h components/grpc_support/include/*.h components/cronet/native/sample/bidi_example.cc ${{ env.BUNDLE }}
       - run: tar cJf ../${{ env.BUNDLE }}.tar.xz ${{ env.BUNDLE }}
       - uses: actions/upload-release-asset@v1
         if: ${{ github.event_name == 'release' }}
@@ -476,6 +480,7 @@ jobs:
       - run: ccache -s
       - run: ../tests/basic.sh out/Release/naive
       - run: mkdir ${{ env.BUNDLE }} && cp out/Release/naive config.json ../LICENSE ../USAGE.txt ${{ env.BUNDLE }}
+      - run: cp out/Release/libcronet.* components/cronet/native/generated/cronet.idl_c.h components/cronet/native/include/*.h components/grpc_support/include/*.h components/cronet/native/sample/bidi_example.cc ${{ env.BUNDLE }}
       - run: tar cJf ../${{ env.BUNDLE }}.tar.xz ${{ env.BUNDLE }}
       - uses: actions/upload-release-asset@v1
         if: ${{ github.event_name == 'release' }}
diff --git a/src/BUILD.gn b/src/BUILD.gn
index 250ac16619..100ced007d 100644
--- a/src/BUILD.gn
+++ b/src/BUILD.gn
@@ -53,6 +53,7 @@ group("gn_all") {
   deps = [
     ":gn_visibility",
     "//net",
+    "//components/cronet",
   ]
 }
 
diff --git a/src/build.sh b/src/build.sh
index e79c38d28d..2515d4ab77 100755
--- a/src/build.sh
+++ b/src/build.sh
@@ -13,6 +13,7 @@ if [ "$1" = debug ]; then
 else
   out=out/Release
   flags="
+    use_thin_lto=false is_cfi=false
     is_official_build=true
     exclude_unwind_tables=true
     enable_resource_allowlist_generation=false
@@ -68,4 +69,4 @@ export DEPOT_TOOLS_WIN_TOOLCHAIN=0
 
 ./gn/out/gn gen "$out" --args="$flags $EXTRA_FLAGS" --script-executable=$PYTHON
 
-ninja -C "$out" naive
+ninja -C "$out" naive cronet
diff --git a/src/components/cronet/BUILD.gn b/src/components/cronet/BUILD.gn
index 2db3d1fd4a..33d59cb28e 100644
--- a/src/components/cronet/BUILD.gn
+++ b/src/components/cronet/BUILD.gn
@@ -9,11 +9,10 @@ import("//build/util/process_version.gni")
 import("//build/util/version.gni")
 import("//components/cronet/native/include/headers.gni")
 import("//components/grpc_support/include/headers.gni")
-import("//testing/test.gni")
 
 declare_args() {
   # If set to true, this will remove histogram manager to reduce binary size.
-  disable_histogram_support = is_mac || is_win
+  disable_histogram_support = true
 }
 
 # Disable histogram support is not allowed on Android.
@@ -59,7 +58,6 @@ source_set("cronet_common") {
     "//base",
     "//components/prefs:prefs",
     "//net",
-    "//third_party/metrics_proto",
   ]
 
   if (!disable_histogram_support) {
@@ -75,23 +73,6 @@ source_set("metrics_util") {
   deps = [ "//base" ]
 }
 
-# Unit tests for Cronet common implementation.
-source_set("cronet_common_unittests") {
-  testonly = true
-
-  deps = [
-    ":cronet_common",
-    "//components/prefs:test_support",
-    "//net:test_support",
-  ]
-
-  sources = [
-    "host_cache_persistence_manager_unittest.cc",
-    "stale_host_resolver_unittest.cc",
-    "url_request_context_config_unittest.cc",
-  ]
-}
-
 # For platforms on which the native Cronet library is used, build the library,
 # a cronet_tests binary that exercises it, and a unit-tests binary.
 # Android and iOS have their own platform-specific rules to build Cronet.
@@ -138,50 +119,6 @@ if (is_android) {
     }
   }
 
-  test("cronet_tests") {
-    deps = [
-      ":cronet_common",
-      "//base",
-      "//base/test:test_support",
-      "//components/cronet/native:cronet_native_impl",
-      "//components/cronet/native/test:cronet_native_tests",
-      "//net",
-    ]
-
-    sources = [
-      "cronet_global_state_stubs.cc",
-      "run_all_unittests.cc",
-    ]
-
-    defines = [ "CRONET_TESTS_IMPLEMENTATION" ]
-
-    if ((is_linux || is_chromeos) && !is_component_build) {
-      public_configs = [ "//build/config/gcc:rpath_for_built_shared_libraries" ]
-    }
-
-    if (is_fuchsia) {
-      use_cfv2 = false
-      additional_manifest_fragments =
-          [ "//build/config/fuchsia/test/network_capabilities.test-cmx" ]
-    }
-  }
-
-  test("cronet_unittests") {
-    deps = [
-      ":cronet_common",
-      ":cronet_common_unittests",
-      "//base",
-      "//base/test:test_support",
-      "//components/cronet/native:cronet_native_unittests",
-      "//net",
-    ]
-
-    sources = [
-      "cronet_global_state_stubs.cc",
-      "run_all_unittests.cc",
-    ]
-  }
-
   _package_dir = "$root_out_dir/cronet"
 
   # Generate LICENSE file by recursively joining all dependent licenses.
@@ -227,30 +164,10 @@ if (is_android) {
     ]
   }
 
-  executable("cronet_native_perf_test") {
-    testonly = true
-    sources = [
-      "native/perftest/main.cc",
-      "native/perftest/perf_test.cc",
-    ]
-    deps = [
-      "//base",
-      "//components/cronet",
-      "//components/cronet/native:cronet_native_headers",
-      "//components/cronet/native/test:cronet_native_tests",
-      "//components/cronet/native/test:cronet_native_testutil",
-      "//net:test_support",
-    ]
-  }
-
   executable("cronet_sample") {
     testonly = true
     sources = [
       "native/sample/main.cc",
-      "native/sample/sample_executor.cc",
-      "native/sample/sample_executor.h",
-      "native/sample/sample_url_request_callback.cc",
-      "native/sample/sample_url_request_callback.h",
     ]
     deps = [
       "//components/cronet",
@@ -260,12 +177,4 @@ if (is_android) {
       public_configs = [ "//build/config/gcc:rpath_for_built_shared_libraries" ]
     }
   }
-
-  test("cronet_sample_test") {
-    sources = [ "native/sample/test/sample_test.cc" ]
-    deps = [
-      ":cronet_sample",
-      "//testing/gtest:gtest",
-    ]
-  }
 }
diff --git a/src/components/cronet/native/BUILD.gn b/src/components/cronet/native/BUILD.gn
index 6ee1271cf3..c3bc307f27 100644
--- a/src/components/cronet/native/BUILD.gn
+++ b/src/components/cronet/native/BUILD.gn
@@ -4,7 +4,6 @@
 
 import("//components/cronet/native/include/headers.gni")
 import("//components/grpc_support/include/headers.gni")
-import("//testing/test.gni")
 
 config("cronet_native_include_config") {
   include_dirs = [
@@ -71,28 +70,3 @@ source_set("cronet_native_impl") {
   ]
 }
 
-# Unit tests for Cronet native API. Depends on cronet_native_impl to test
-# implementation details.
-source_set("cronet_native_unittests") {
-  testonly = true
-
-  deps = [
-    ":cronet_native_impl",
-    "//base/test:test_support",
-    "//components/cronet/native/test:cronet_native_testutil",
-    "//net:test_support",
-    "//testing/gtest",
-  ]
-
-  configs += [ ":cronet_native_include_config" ]
-
-  sources = [
-    "engine_unittest.cc",
-    "native_metrics_util_test.cc",
-    "runnables_unittest.cc",
-
-    # Generated from cronet.idl.
-    "generated/cronet.idl_impl_interface_unittest.cc",
-    "generated/cronet.idl_impl_struct_unittest.cc",
-  ]
-}
diff --git a/src/components/cronet/native/sample/bidi_example.cc b/src/components/cronet/native/sample/bidi_example.cc
new file mode 100644
index 0000000000..5f96646ab2
--- /dev/null
+++ b/src/components/cronet/native/sample/bidi_example.cc
@@ -0,0 +1,165 @@
+// Copyright 2018 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// ninja -C out/Release cronet
+// g++ components/cronet/native/sample/bidi_example.cc -I
+// components/cronet/native/generated -I components/cronet/native/include -I
+// components/grpc_support/include/ out/Release/libcronet.100.0.4896.60.so
+// LD_LIBRARY_PATH=out/Release ./a.out
+#include <atomic>
+#include <iostream>
+#include <string>
+#include <thread>
+
+#include "bidirectional_stream_c.h"
+#include "cronet_c.h"
+
+class BidirectionalStreamCallback {
+ public:
+  bidirectional_stream* stream = nullptr;
+  std::string write_data;
+  std::string read_buffer;
+  std::atomic<bool> done = false;
+
+  bidirectional_stream_callback* callback() const { return &s_callback; }
+
+ private:
+  static BidirectionalStreamCallback* FromStream(bidirectional_stream* stream) {
+    return reinterpret_cast<BidirectionalStreamCallback*>(stream->annotation);
+  }
+
+  // C callbacks.
+  static void on_stream_ready_callback(bidirectional_stream* stream) {
+    std::cout << "on_stream_ready_callback" << std::endl;
+    BidirectionalStreamCallback* self = FromStream(stream);
+    bidirectional_stream_write(stream, self->write_data.data(),
+                               self->write_data.size(), true);
+    bidirectional_stream_flush(stream);
+  }
+
+  static void on_response_headers_received_callback(
+      bidirectional_stream* stream,
+      const bidirectional_stream_header_array* headers,
+      const char* negotiated_protocol) {
+    std::cout << "on_response_headers_received_callback negotiated_protocol="
+              << negotiated_protocol << "\n";
+    BidirectionalStreamCallback* self = FromStream(stream);
+    for (size_t i = 0; i < headers->count; ++i) {
+      if (headers->headers[i].key[0] == '\0')
+        continue;
+      std::cout << headers->headers[i].key << ": " << headers->headers[i].value
+                << std::endl;
+    }
+    self->read_buffer.resize(32768);
+    bidirectional_stream_read(stream, self->read_buffer.data(),
+                              self->read_buffer.size());
+  }
+
+  static void on_read_completed_callback(bidirectional_stream* stream,
+                                         char* data,
+                                         int count) {
+    std::cout << "on_read_completed_callback " << count << "\n";
+    BidirectionalStreamCallback* self = FromStream(stream);
+    if (count == 0)
+      return;
+    std::cout.write(data, count);
+    std::cout << "\n";
+    bidirectional_stream_read(stream, self->read_buffer.data(),
+                              self->read_buffer.size());
+  }
+
+  static void on_write_completed_callback(bidirectional_stream* stream,
+                                          const char* data) {
+    std::cout << "on_write_completed_callback\n";
+  }
+
+  static void on_response_trailers_received_callback(
+      bidirectional_stream* stream,
+      const bidirectional_stream_header_array* trailers) {
+    std::cout << "on_response_trailers_received_callback\n";
+    for (size_t i = 0; i < trailers->count; ++i) {
+      std::cout << trailers->headers[i].key << ": "
+                << trailers->headers[i].value << std::endl;
+    }
+  }
+
+  static void on_succeded_callback(bidirectional_stream* stream) {
+    std::cout << "on_succeded_callback\n";
+    BidirectionalStreamCallback* self = FromStream(stream);
+    self->done = true;
+  }
+
+  static void on_failed_callback(bidirectional_stream* stream, int net_error) {
+    std::cout << "on_failed_callback " << net_error << "\n";
+    BidirectionalStreamCallback* self = FromStream(stream);
+    self->done = true;
+  }
+
+  static void on_canceled_callback(bidirectional_stream* stream) {
+    std::cout << "on_canceled_callback\n";
+    BidirectionalStreamCallback* self = FromStream(stream);
+    self->done = true;
+  }
+
+  static bidirectional_stream_callback s_callback;
+};
+
+bidirectional_stream_callback BidirectionalStreamCallback::s_callback = {
+    on_stream_ready_callback,
+    on_response_headers_received_callback,
+    on_read_completed_callback,
+    on_write_completed_callback,
+    on_response_trailers_received_callback,
+    on_succeded_callback,
+    on_failed_callback,
+    on_canceled_callback,
+};
+
+Cronet_EnginePtr CreateCronetEngine() {
+  Cronet_EnginePtr cronet_engine = Cronet_Engine_Create();
+  Cronet_EngineParamsPtr engine_params = Cronet_EngineParams_Create();
+  Cronet_EngineParams_user_agent_set(engine_params, "CronetSample/1");
+  Cronet_EngineParams_experimental_options_set(engine_params, R"(
+    {"ssl_key_log_file": "/tmp/keys"}
+)");
+
+  Cronet_Engine_StartWithParams(cronet_engine, engine_params);
+  Cronet_EngineParams_Destroy(engine_params);
+  return cronet_engine;
+}
+
+int main(int argc, const char* argv[]) {
+  if (argc != 3) {
+    std::cout << "Usage: " << argv[0]
+              << " https://my-caddy-forwardproxy.com \"Basic $(printf "
+                 "user:pass | base64)\"\n";
+    return 1;
+  }
+  const char* proxy_server = argv[1];
+  const char* password_base64 = argv[2];
+  Cronet_EnginePtr cronet_engine = CreateCronetEngine();
+  stream_engine* cronet_stream_engine =
+      Cronet_Engine_GetStreamEngine(cronet_engine);
+
+  BidirectionalStreamCallback stream_callback;
+  stream_callback.write_data = "GET / HTTP/1.1\r\nHost: example.com\r\n\r\n";
+  stream_callback.stream = bidirectional_stream_create(
+      cronet_stream_engine, &stream_callback, stream_callback.callback());
+  bidirectional_stream_header headers[2] = {
+      {"proxy-authorization", password_base64},
+      {"real-authority", "example.com:80"},
+  };
+  bidirectional_stream_header_array header_array = {2, 2, headers};
+  bidirectional_stream_start(stream_callback.stream, proxy_server, 0, "CONNECT",
+                             &header_array, false);
+  std::cout << "bidirectional_stream_start" << std::endl;
+  while (!stream_callback.done) {
+    std::this_thread::sleep_for(std::chrono::milliseconds(100));
+  }
+  bidirectional_stream_destroy(stream_callback.stream);
+
+  Cronet_Engine_Shutdown(cronet_engine);
+  Cronet_Engine_Destroy(cronet_engine);
+  return 0;
+}
diff --git a/src/components/grpc_support/BUILD.gn b/src/components/grpc_support/BUILD.gn
index 133aa30159..89fd8fde4e 100644
--- a/src/components/grpc_support/BUILD.gn
+++ b/src/components/grpc_support/BUILD.gn
@@ -18,32 +18,3 @@ source_set("grpc_support") {
   ]
 }
 
-# Depends on ":grpc_support" implementation.
-source_set("bidirectional_stream_unittest") {
-  testonly = true
-  sources = [ "bidirectional_stream_unittest.cc" ]
-
-  deps = [
-    ":grpc_support",
-    "//base",
-    "//net",
-    "//net:test_support",
-  ]
-
-  public_deps = [ "//components/grpc_support/test:get_stream_engine_header" ]
-}
-
-# Depends on ":headers" to avoid ":grpc_support" implementation.
-source_set("bidirectional_stream_test") {
-  testonly = true
-  sources = [ "bidirectional_stream_unittest.cc" ]
-
-  deps = [
-    ":headers",
-    "//base",
-    "//net",
-    "//net:test_support",
-  ]
-
-  public_deps = [ "//components/grpc_support/test:get_stream_engine_header" ]
-}
diff --git a/src/components/prefs/BUILD.gn b/src/components/prefs/BUILD.gn
index c1828d1027..21b5883bfd 100644
--- a/src/components/prefs/BUILD.gn
+++ b/src/components/prefs/BUILD.gn
@@ -65,56 +65,4 @@ component("prefs") {
     ]
     deps += [ "android:jni_headers" ]
   }
-}
-
-static_library("test_support") {
-  testonly = true
-  sources = [
-    "mock_pref_change_callback.cc",
-    "mock_pref_change_callback.h",
-    "pref_store_observer_mock.cc",
-    "pref_store_observer_mock.h",
-    "pref_test_utils.cc",
-    "pref_test_utils.h",
-    "testing_pref_service.cc",
-    "testing_pref_service.h",
-    "testing_pref_store.cc",
-    "testing_pref_store.h",
-  ]
-
-  public_deps = [ ":prefs" ]
-  deps = [
-    "//base",
-    "//base/test:test_support",
-    "//testing/gmock",
-    "//testing/gtest",
-  ]
-}
-
-source_set("unit_tests") {
-  testonly = true
-  sources = [
-    "default_pref_store_unittest.cc",
-    "in_memory_pref_store_unittest.cc",
-    "json_pref_store_unittest.cc",
-    "overlay_user_pref_store_unittest.cc",
-    "persistent_pref_store_unittest.cc",
-    "persistent_pref_store_unittest.h",
-    "pref_change_registrar_unittest.cc",
-    "pref_member_unittest.cc",
-    "pref_notifier_impl_unittest.cc",
-    "pref_service_unittest.cc",
-    "pref_value_map_unittest.cc",
-    "pref_value_store_unittest.cc",
-    "scoped_user_pref_update_unittest.cc",
-    "segregated_pref_store_unittest.cc",
-  ]
-
-  deps = [
-    ":test_support",
-    "//base",
-    "//base/test:test_support",
-    "//testing/gmock",
-    "//testing/gtest",
-  ]
-}
+}
\ No newline at end of file
diff --git a/src/net/spdy/spdy_http_utils.cc b/src/net/spdy/spdy_http_utils.cc
index 3592f9ec1b..e942278106 100644
--- a/src/net/spdy/spdy_http_utils.cc
+++ b/src/net/spdy/spdy_http_utils.cc
@@ -107,6 +107,10 @@ void CreateSpdyHeadersFromHttpRequest(const HttpRequestInfo& info,
   HttpRequestHeaders::Iterator it(request_headers);
   while (it.GetNext()) {
     std::string name = base::ToLowerASCII(it.name());
+    if (info.method == "CONNECT" && name == "_real_authority") {
+      (*headers)[spdy::kHttp2AuthorityHeader] = it.value();
+      continue;
+    }
     if (name.empty() || name[0] == ':' || name == "connection" ||
         name == "proxy-connection" || name == "transfer-encoding" ||
         name == "host") {