diff --git a/src/build.sh b/src/build.sh
new file mode 100755
index 0000000000..bd2f5394df
--- /dev/null
+++ b/src/build.sh
@@ -0,0 +1,74 @@
+#!/bin/sh
+set -e
+
+export TMPDIR="$PWD/tmp"
+mkdir -p "$TMPDIR"
+
+if [ "$1" = debug ]; then
+  out=out/Debug
+  flags="$EXTRA_FLAGS
+    is_debug=true
+    is_component_build=true"
+else
+  out=out/Release
+  flags="$EXTRA_FLAGS
+    is_official_build=true
+    use_jumbo_build=true
+    exclude_unwind_tables=true
+    symbol_level=0"
+fi
+
+if which ccache >/dev/null 2>&1; then
+  export CCACHE_SLOPPINESS=time_macros
+  export CCACHE_BASEDIR="$PWD"
+  export CCACHE_CPP2=yes
+  flags="$flags"'
+   cc_wrapper="ccache"'
+elif [ -f "$HOME"/.cargo/bin/sccache* ]; then
+  export PATH="$PATH:$HOME/.cargo/bin"
+  flags="$flags"'
+   cc_wrapper="sccache"'
+fi
+
+flags="$flags"'
+  is_clang=true
+  linux_use_bundled_binutils=false
+
+  fatal_linker_warnings=false
+  treat_warnings_as_errors=false
+  use_sysroot=false
+
+  fieldtrial_testing_like_official_build=true
+
+  use_cups=false
+  use_dbus=false
+  use_gio=false
+  use_platform_icu_alternatives=true
+
+  disable_file_support=true
+  enable_websockets=false
+  disable_ftp_support=true
+  use_kerberos=false
+  disable_brotli_filter=true
+  enable_mdns=false
+  enable_reporting=false
+  include_transport_security_state_preload_list=false
+'
+
+if [ "$(uname)" = Linux ]; then
+  flags="$flags"'
+    use_ozone=true
+    ozone_auto_platforms=false
+    ozone_platform="headless"
+    ozone_platform_headless=true'
+fi
+
+rm -rf "./$out"
+mkdir -p out
+
+python2=$(which python2 2>/dev/null || which python 2>/dev/null)
+export DEPOT_TOOLS_WIN_TOOLCHAIN=0
+
+./gn/out/gn gen "$out" --args="$flags" --script-executable=$python2
+
+ninja -C "$out" naive
diff --git a/src/get-clang.sh b/src/get-clang.sh
new file mode 100755
index 0000000000..bb255695ba
--- /dev/null
+++ b/src/get-clang.sh
@@ -0,0 +1,58 @@
+#!/bin/sh
+set -ex
+
+ARCH=$(uname)
+case "$ARCH" in
+  MINGW*) ARCH=Windows;;
+  MSYS*) ARCH=Windows;;
+esac
+
+# Clang
+python2=$(which python2 2>/dev/null || which python 2>/dev/null)
+CLANG_REVISION=$($python2 tools/clang/scripts/update.py --print-revision)
+CLANG_PATH="clang-$CLANG_REVISION.tgz"
+case "$ARCH" in
+  Linux) clang_url="https://commondatastorage.googleapis.com/chromium-browser-clang/Linux_x64/$CLANG_PATH";;
+  Darwin) clang_url="https://commondatastorage.googleapis.com/chromium-browser-clang/Mac/$CLANG_PATH";;
+  Windows) clang_url="https://commondatastorage.googleapis.com/chromium-browser-clang/Win/$CLANG_PATH";;
+  *) exit 1;;
+esac
+if [ ! -d third_party/llvm-build/Release+Asserts/bin ]; then
+  mkdir -p third_party/llvm-build/Release+Asserts
+  curl "$clang_url" | tar xzf - -C third_party/llvm-build/Release+Asserts
+fi
+
+# AFDO profile (Linux)
+if [ "$ARCH" = Linux -a ! -f chrome/android/profiles/afdo.prof ]; then
+  AFDO_PATH=$(cat chrome/android/profiles/newest.txt)
+  afdo_url="https://storage.googleapis.com/chromeos-prebuilt/afdo-job/llvm/$AFDO_PATH"
+  curl "$afdo_url" | bzip2 -cd >chrome/android/profiles/afdo.prof
+fi
+
+# dsymutil (Mac)
+if [ "$ARCH" = Darwin ]; then
+  mkdir -p tools/clang/dsymutil
+  DSYMUTIL_PATH="dsymutil-$CLANG_REVISION.tgz"
+  dsymutil_url="http://commondatastorage.googleapis.com/chromium-browser-clang-staging/Mac/$DSYMUTIL_PATH"
+  curl "$dsymutil_url" | tar xzf - -C tools/clang/dsymutil
+fi
+
+# sccache (Windows)
+if [ "$ARCH" = Windows ]; then
+  sccache_url="https://github.com/mozilla/sccache/releases/download/0.2.8/sccache-0.2.8-x86_64-pc-windows-msvc.tar.gz"
+  mkdir -p ~/.cargo/bin
+  curl -L "$sccache_url" | tar xzf - --strip=1 -C ~/.cargo/bin
+fi
+
+# gn
+if [ ! -f gn/out/gn ]; then
+  GN_VERSION=$(grep "'gn_version':" buildtools/DEPS | cut -d"'" -f4)
+  mkdir -p gn/out
+  cd gn/out
+  case "$ARCH" in
+    Linux) curl -L "https://chrome-infra-packages.appspot.com/dl/gn/gn/linux-amd64/+/$GN_VERSION" -o gn.zip;;
+    Darwin) curl -L "https://chrome-infra-packages.appspot.com/dl/gn/gn/mac-amd64/+/$GN_VERSION" -o gn.zip;;
+    Windows) curl -L "https://chrome-infra-packages.appspot.com/dl/gn/gn/windows-amd64/+/$GN_VERSION" -o gn.zip;;
+  esac
+  unzip gn.zip
+fi