Change avd.py script to let developers point to emulator SDK.

build/android/pylib/constants.py

 # 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 a set of constants shared by test runners and other scripts."""
 
 import collections
 import logging
 import os
 import subprocess
@@ skipping 113 matching lines @@
     '/data/data/' + PACKAGE_INFO['chrome'].package + '/files')
 
 SCREENSHOTS_DIR = os.path.join(DIR_SOURCE_ROOT, 'out_screenshots')
 
 ANDROID_SDK_VERSION = 19
 ANDROID_SDK_ROOT = os.path.join(DIR_SOURCE_ROOT,
                                 'third_party/android_tools/sdk')
 ANDROID_NDK_ROOT = os.path.join(DIR_SOURCE_ROOT,
                                 'third_party/android_tools/ndk')
 
-EMULATOR_SDK_ROOT = os.path.join(DIR_SOURCE_ROOT, 'android_emulator_sdk')
+EMULATOR_SDK_ROOT = os.environ.get('ANDROID_EMULATOR_SDK_ROOT',
+                                   os.path.join(DIR_SOURCE_ROOT,
+                                                'android_emulator_sdk'))
 
 UPSTREAM_FLAKINESS_SERVER = 'test-results.appspot.com'
 
 
 def GetBuildType():
   try:
     return os.environ['BUILDTYPE']
   except KeyError:
     raise Exception('The BUILDTYPE environment variable has not been set')
 
@@ skipping 35 matching lines @@
       subprocess.call(['adb', 'version'], stdout=devnull, stderr=devnull)
     return 'adb'
   except OSError:
     logging.debug('No adb found in $PATH, fallback to checked in binary.')
     return os.path.join(ANDROID_SDK_ROOT, 'platform-tools', 'adb')
 
 
 # Exit codes
 ERROR_EXIT_CODE = 1
 WARNING_EXIT_CODE = 88