cc: Add OutputSurface state snapshots.

content/browser/compositor/browser_compositor_output_surface.h

 // 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.
 
 #ifndef CONTENT_BROWSER_COMPOSITOR_BROWSER_COMPOSITOR_OUTPUT_SURFACE_H_
 #define CONTENT_BROWSER_COMPOSITOR_BROWSER_COMPOSITOR_OUTPUT_SURFACE_H_
 
 #include "base/macros.h"
 #include "base/threading/non_thread_safe.h"
 #include "build/build_config.h"
@@ skipping 62 matching lines @@
 
   // Constructor used by the Vulkan implementation.
   BrowserCompositorOutputSurface(
       const scoped_refptr<cc::VulkanContextProvider>& vulkan_context_provider,
       const scoped_refptr<ui::CompositorVSyncManager>& vsync_manager,
       cc::SyntheticBeginFrameSource* begin_frame_source);
 
   scoped_refptr<ui::CompositorVSyncManager> vsync_manager_;
   cc::SyntheticBeginFrameSource* synthetic_begin_frame_source_;
   ReflectorImpl* reflector_;
+  base::TimeTicks last_vsync_timebase_;
+  base::TimeDelta last_vsync_interval_;
 
  private:
   std::unique_ptr<display_compositor::CompositorOverlayCandidateValidator>
       overlay_candidate_validator_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserCompositorOutputSurface);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_COMPOSITOR_BROWSER_COMPOSITOR_OUTPUT_SURFACE_H_