Add latency measurement system

ui/compositor/layer_unittest.cc

 // 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.
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/path_service.h"
@@ skipping 272 matching lines @@
     ended_ = true;
   }
 
   virtual void OnCompositingAborted(Compositor* compositor) OVERRIDE {
     aborted_ = true;
   }
 
   virtual void OnCompositingLockStateChanged(Compositor* compositor) OVERRIDE {
   }
 
+  virtual void OnReceivedLatencyInfo(Compositor*,
+      const WebKit::WebLatencyInfoImpl&) OVERRIDE {}
+
   bool started_;
   bool ended_;
   bool aborted_;
 
   DISALLOW_COPY_AND_ASSIGN(TestCompositorObserver);
 };
 
 }  // namespace
 
 #if defined(OS_WIN)
@@ skipping 930 matching lines @@
 
   // Resize layer.
   child->SetBounds(gfx::Rect(200, 200, 400, 400));
   child->SetVisible(true);
   EXPECT_TRUE(schedule_draw_invoked_);
   DrawTree(root.get());
   EXPECT_TRUE(delegate.painted());
 }
 
 }  // namespace ui