Silence warning about falling back to checked-in adb binary

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
 import sys
 
 
 DIR_SOURCE_ROOT = os.path.abspath(os.path.join(os.path.dirname(__file__),
                                                os.pardir, os.pardir, os.pardir))
 ISOLATE_DEPS_DIR = os.path.join(DIR_SOURCE_ROOT, 'isolate_deps_dir')
 
 CHROMIUM_TEST_SHELL_HOST_DRIVEN_DIR = os.path.join(
@@ skipping 133 matching lines @@
 
   Args:
     build_type: Build type, generally 'Debug' or 'Release'. Defaults to the
       globally set build type environment variable BUILDTYPE.
   """
   return os.path.abspath(os.path.join(
       DIR_SOURCE_ROOT, os.environ.get('CHROMIUM_OUT_DIR', 'out'),
       GetBuildType() if build_type is None else build_type))
 
 
-def _GetADBPath():
+def _Memoize(func):
+  def Wrapper():
+    try:
+      return func._result
+    except AttributeError:
+      func._result = func()
+      return func._result
+  return Wrapper
+
+
+@_Memoize
+def GetAdbPath():
   if os.environ.get('ANDROID_SDK_ROOT'):
     return 'adb'
   # If envsetup.sh hasn't been sourced and there's no adb in the path,
   # set it here.
   try:
     with file(os.devnull, 'w') as devnull:
       subprocess.call(['adb', 'version'], stdout=devnull, stderr=devnull)
     return 'adb'
   except OSError:
-    print >> sys.stderr, 'No adb found in $PATH, fallback to checked in binary.'
+    logging.debug('No adb found in $PATH, fallback to checked in binary.')
     return os.path.join(ANDROID_SDK_ROOT, 'platform-tools', 'adb')
 
 
-ADB_PATH = _GetADBPath()
-
 # Exit codes
 ERROR_EXIT_CODE = 1
 WARNING_EXIT_CODE = 88