Add an environment variable override to the default output name

Review URL: https://chromiumcodereview.appspot.com/22640007

git-svn-id: http://src.chromium.org/svn/trunk/src/build@216627 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

android/pylib/cmd_helper.py

@@ -100,7 +100,8 @@ def GetCmdStatusAndOutput(args, cwd=None, shell=False):
 
 
 class OutDirectory(object):
-  _out_directory = os.path.join(constants.DIR_SOURCE_ROOT, 'out')
+  _out_directory = os.path.join(constants.DIR_SOURCE_ROOT,
+      os.environ.get('CHROMIUM_OUT_DIR','out'))
   @staticmethod
   def set(out_directory):
     OutDirectory._out_directory = out_directory