Made clang use the gold linker for Android

build/android/envsetup_functions.sh

Index: build/android/envsetup_functions.sh
diff --git a/build/android/envsetup_functions.sh b/build/android/envsetup_functions.sh
index 9a756a46c86b55fa1a54111682db8b95f9d0b657..55910a66e15ace2fa95bf60599b6e7fe2ba47358 100755
--- a/build/android/envsetup_functions.sh
+++ b/build/android/envsetup_functions.sh
@@ -48,6 +48,13 @@ common_vars_defines() {
   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}