Add latency measurement system

cc/test/layer_tree_test_common.cc

 // Copyright 2011 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.
 
 #include "cc/test/layer_tree_test_common.h"
 
 #include "base/stl_util.h"
 #include "cc/active_animation.h"
 #include "cc/content_layer.h"
 #include "cc/font_atlas.h"
@@ skipping 244 matching lines @@
     virtual void scheduleComposite() OVERRIDE
     {
         m_testHooks->scheduleComposite();
     }
 
     virtual scoped_ptr<FontAtlas> createFontAtlas() OVERRIDE
     {
         return scoped_ptr<FontAtlas>();
     }
 
+    virtual void onReceivedLatencyInfo(const WebKit::WebLatencyInfoImpl&) OVERRIDE
+    {
+    }
+
 private:
     explicit ThreadedMockLayerTreeHostClient(TestHooks* testHooks) : m_testHooks(testHooks) { }
 
     TestHooks* m_testHooks;
 };
 
 ThreadedTest::ThreadedTest()
     : m_beginning(false)
     , m_endWhenBeginReturns(false)
     , m_timedOut(false)
@@ skipping 230 matching lines @@
     ASSERT_FALSE(m_layerTreeHost.get());
     m_client.reset();
     if (m_timedOut) {
         FAIL() << "Test timed out";
         return;
     }
     afterTest();
 }
 
 }  // namespace cc