Use goma for android builds.

build/android/envsetup.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.
 
 # Sets up environment for building Chromium on Android. Only Android NDK,
 # Revision 6b on Linux or Mac is offically supported.
 #
 # To run this script, the system environment ANDROID_NDK_ROOT must be set
@@ skipping 48 matching lines @@
 if [ -z "${CHROME_SRC}" ]; then
   # If $CHROME_SRC was not set, assume current directory is CHROME_SRC.
   export CHROME_SRC=$(readlink -f .)
 fi
 
 if [ ! -d "${CHROME_SRC}" ]; then
   echo "CHROME_SRC must be set to the path of Chrome source code." >& 2
   return 1
 fi
 
-make() {
-  # TODO(michaelbai): how to use ccache in NDK.
-  if [ -n "${USE_CCACHE}" ]; then
-    if [ -e "${PREBUILT_CCACHE_PATH}" ]; then
-      use_ccache_var="$PREBUILT_CCACHE_PATH "
-    else
-      use_ccache_var=""
-    fi
-  fi
-  # Only cross-compile if the build is being done either from Chromium's src/
-  # directory, or through WebKit, in which case the WEBKIT_ANDROID_BUILD
-  # environment variable will be defined. WebKit uses a different directory.
-  if [ -f "$PWD/build/android/envsetup.sh" ] ||
-     [ -n "${WEBKIT_ANDROID_BUILD}" ]; then
-    CC="${use_ccache_var}${CROSS_CC}" CXX="${use_ccache_var}${CROSS_CXX}" \
-    LINK="${CROSS_LINK}" AR="${CROSS_AR}" RANLIB="${CROSS_RANLIB}" \
-      command make $*
-  else
-    command make $*
-  fi
-}
-
 # Performs a gyp_chromium run to convert gyp->Makefile for android code.
 android_gyp() {
   "${CHROME_SRC}/build/gyp_chromium" --depth="${CHROME_SRC}"
 }
 
 firstword() {
   echo "${1}"
 }
 
 export CROSS_AR="$(firstword "${ANDROID_TOOLCHAIN}"/*-ar)"
@@ skipping 45 matching lines @@
 export GYP_DEFINES="${DEFINES}"
 
 # Use the "android" flavor of the Makefile generator for both Linux and OS X.
 export GYP_GENERATORS="make-android"
 
 # Use our All target as the default
 export GYP_GENERATOR_FLAGS="${GYP_GENERATOR_FLAGS} default_target=All"
 
 # We want to use our version of "all" targets.
 export CHROMIUM_GYP_FILE="${CHROME_SRC}/build/all_android.gyp"