android: Use use_goma=1 gomadir gyp defines instead of magic GOMA_DIR env var.

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.  It can either be
 # compiled with the Android tree or using the Android SDK/NDK. To build with
 # NDK/SDK: ". build/android/envsetup.sh".  Environment variable
 # ANDROID_SDK_BUILD=1 will then be defined and used in the rest of the setup to
 # specifiy build type.
@@ skipping 101 matching lines @@
 if [[ -n "$CHROME_ANDROID_VALGRIND_BUILD" ]]; then
 # arm_thumb=0 is a workaround for https://bugs.kde.org/show_bug.cgi?id=270709
   DEFINES+=" arm_thumb=0 release_extra_cflags='-fno-inline\
  -fno-omit-frame-pointer -fno-builtin' release_valgrind_build=1\
  release_optimize=1"
 fi
 
 # Source a bunch of helper functions
 . ${CHROME_SRC}/build/android/adb_device_functions.sh
 
+# TODO(thakis), Jan 18 2014: Remove this after two weeks or so, after telling
+# everyone to set use_goma in GYP_DEFINES instead of a GOMA_DIR env var.
 if [[ -d $GOMA_DIR ]]; then
-  num_cores="$(grep --count ^processor /proc/cpuinfo)"
-# Goma is IO-ish you want more threads than you have cores.
-  let "goma_threads=num_cores*2"
-  if [ -z "${GOMA_COMPILER_PROXY_THREADS}" -a "${goma_threads}" -gt 16 ]; then
-# The default is 16 threads, if the machine has many cores we crank it up a bit
-    GOMA_COMPILER_PROXY_THREADS="${goma_threads}"
-    export GOMA_COMPILER_PROXY_THREADS
-  fi
+  DEFINES+=" use_goma=1 gomadir=$GOMA_DIR"
 fi
 
 # Declare Android are cross compile.
 export GYP_CROSSCOMPILE=1
 
 # Performs a gyp_chromium run to convert gyp->Makefile for android code.
 android_gyp() {
   # This is just a simple wrapper of gyp_chromium, please don't add anything
   # in this function.
   echo "GYP_GENERATORS set to '$GYP_GENERATORS'"
   (
     "${CHROME_SRC}/build/gyp_chromium" --depth="${CHROME_SRC}" --check "$@"
   )
 }