Unit tests have been created for the GPUTiming.

ui/gl/gl.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
 
   'targets': [
@@ skipping 265 matching lines @@
       ],
       'include_dirs': [
         '../..',
       ],
       'sources': [
         'gl_bindings_autogen_mock.cc',
         'gl_bindings_autogen_mock.h',
         'gl_mock.cc',
         'gl_mock.h',
         'gl_mock_autogen_gl.h',
+        'gpu_timing_fake.cc',
+        'gpu_timing_fake.h',
       ],
     },
   ],
   'conditions': [
     ['OS=="android"' , {
       'targets': [
         {
           'target_name': 'surface_jni_headers',
           'type': 'none',
           'variables': {
@@ skipping 14 matching lines @@
           ],
           'variables': {
             'jni_gen_package': 'ui/gl',
           },
           'includes': [ '../../build/jni_generator.gypi' ],
         },
       ],
     }],
   ],
 }