Made clang use the gold linker for Android

build/android/envsetup_functions.sh

 #!/bin/bash
 
 # Copyright (c) 2012 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.
 
 # Defines functions for envsetup.sh which sets up environment for building
 # Chromium on Android.  The build can be either use the Android NDK/SDK or
 # android source tree.  Each has a unique init function which calls functions
 # prefixed with "common_" that is common for both environment setups.
@@ skipping 30 matching lines @@
   # Set only if not already set.
   # Don't override ANDROID_TOOLCHAIN if set by Android configuration env.
   export ANDROID_TOOLCHAIN=${ANDROID_TOOLCHAIN:-${toolchain_path}}
 
   common_check_toolchain
 
   # Add Android SDK/NDK tools to system path.
   export PATH=$PATH:${ANDROID_NDK_ROOT}
   export PATH=$PATH:${ANDROID_SDK_ROOT}/tools
   export PATH=$PATH:${ANDROID_SDK_ROOT}/platform-tools
+
+  # This must be set before ANDROID_TOOLCHAIN, so that clang could find the
+  # gold linker.
+  # TODO(michaelbai): Remove this path once the gold linker become the default
+  # linker.
+  export PATH=$PATH:${CHROME_SRC}/build/android/${toolchain_arch}-gold
+
   # Must have tools like arm-linux-androideabi-gcc on the path for ninja
   export PATH=$PATH:${ANDROID_TOOLCHAIN}
 
   # Add Chromium Android development scripts to system path.
   # Must be after CHROME_SRC is set.
   export PATH=$PATH:${CHROME_SRC}/build/android
 
   # TODO(beverloo): Remove these once all consumers updated to --strip-binary.
   export OBJCOPY=$(echo ${ANDROID_TOOLCHAIN}/*-objcopy)
   export STRIP=$(echo ${ANDROID_TOOLCHAIN}/*-strip)
@@ skipping 246 matching lines @@
 
   export GYP_GENERATORS="android"
 
   export GYP_GENERATOR_FLAGS="${GYP_GENERATOR_FLAGS} default_target=All"
   export GYP_GENERATOR_FLAGS="${GYP_GENERATOR_FLAGS} limit_to_target_all=1"
   export GYP_GENERATOR_FLAGS="${GYP_GENERATOR_FLAGS} auto_regeneration=0"
 
   # TODO(torne): This isn't upstream yet. Upstream it or remove this setting.
   export CHROMIUM_GYP_FILE="${CHROME_SRC}/build/all_android_webview.gyp"
 }