libyuv: Add got_revision property mapping.

scripts/slave/recipe_modules/libyuv/gclient_config.py

 # Copyright 2014 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.
 
 import DEPS
 CONFIG_CTX = DEPS['gclient'].CONFIG_CTX
 ChromiumGitURL = DEPS['gclient'].config.ChromiumGitURL
 
 
 @CONFIG_CTX()
 def libyuv(c):
   s = c.solutions.add()
   s.name = 'src'
   s.url = ChromiumGitURL(c, 'libyuv', 'libyuv')
   s.deps_file = 'DEPS'
   s.custom_vars['root_dir'] = 'src'
+  c.got_revision_mapping['src'] = 'got_revision'
 
 @CONFIG_CTX(includes=['libyuv', 'android'])
 def libyuv_android(c):
   pass
 
 @CONFIG_CTX(includes=['libyuv'])
 def libyuv_ios(c):
   c.target_os.add('mac')
   c.target_os.add('ios')
 
 @CONFIG_CTX(includes=['libyuv'])
 def libyuv_valgrind(c):
   c.solutions[0].custom_deps['src/chromium/src/third_party/valgrind'] = \
       ChromiumGitURL(c, 'chromium', 'deps', 'valgrind', 'binaries')