Add latency measurement system

cc/gl_renderer_pixeltest.cc

 // Copyright 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.
 
 #include "cc/gl_renderer.h"
 
 #include "base/file_util.h"
 #include "base/path_service.h"
 #include "cc/draw_quad.h"
 #include "cc/prioritized_resource_manager.h"
@@ skipping 23 matching lines @@
     static LayerTreeSettings fake_settings;
     return fake_settings;
   }
   virtual void didLoseOutputSurface() OVERRIDE { }
   virtual void onSwapBuffersComplete() OVERRIDE { }
   virtual void setFullRootLayerDamage() OVERRIDE { }
   virtual void setManagedMemoryPolicy(const ManagedMemoryPolicy&) OVERRIDE {}
   virtual void enforceManagedMemoryPolicy(
       const ManagedMemoryPolicy&) OVERRIDE {}
   virtual bool hasImplThread() const OVERRIDE { return false; }
+  virtual void onReceivedLatencyInfo(
+      const WebKit::WebLatencyInfoImpl&) OVERRIDE { }
 };
 
 
 class GLRendererPixelTest : public testing::Test {
  protected:
   GLRendererPixelTest() {}
 
   virtual void SetUp() {
     gfx::InitializeGLBindings(gfx::kGLImplementationOSMesaGL);
     output_surface_ = PixelTestOutputSurface::create();
@@ skipping 53 matching lines @@
   FilePath test_data_dir;
   ASSERT_TRUE(PathService::Get(cc::test::DIR_TEST_DATA, &test_data_dir));
   // test::WritePNGFile(bitmap, test_data_dir.AppendASCII("green.png"));
   EXPECT_TRUE(test::IsSameAsPNGFile(bitmap,
                                     test_data_dir.AppendASCII("green.png")));
 }
 #endif
 
 }  // namespace
 }  // namespace cc