WIP: Plumbing input event latency reporting through Mus GPU.

gpu/ipc/service/pass_through_image_transport_surface.h

 // Copyright 2016 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 GPU_IPC_SERVICE_PASS_THROUGH_IMAGE_TRANSPORT_SURFACE_H_
 #define GPU_IPC_SERVICE_PASS_THROUGH_IMAGE_TRANSPORT_SURFACE_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 34 matching lines @@
       const SwapCompletionCallback& callback) override;
   bool OnMakeCurrent(gl::GLContext* context) override;
 
  private:
   ~PassThroughImageTransportSurface() override;
 
   // If updated vsync parameters can be determined, send this information to
   // the browser.
   void SendVSyncUpdateIfAvailable();
 
-  void SetLatencyInfo(const std::vector<ui::LatencyInfo>& latency_info);
+  // Add |latency_info| to be reported and augumented with GPU latency
+  // components next time there is a GPU buffer swap.
+  void AddLatencyInfo(const std::vector<ui::LatencyInfo>& latency_info);
   std::unique_ptr<std::vector<ui::LatencyInfo>> StartSwapBuffers();
   void FinishSwapBuffers(
       std::unique_ptr<std::vector<ui::LatencyInfo>> latency_info,
       gfx::SwapResult result);
   void FinishSwapBuffersAsync(
       std::unique_ptr<std::vector<ui::LatencyInfo>> latency_info,
       GLSurface::SwapCompletionCallback callback,
       gfx::SwapResult result);
 
   base::WeakPtr<ImageTransportSurfaceDelegate> delegate_;
   bool did_set_swap_interval_;
   std::vector<ui::LatencyInfo> latency_info_;
   base::WeakPtrFactory<PassThroughImageTransportSurface> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PassThroughImageTransportSurface);
 };
 
 }  // namespace gpu
 
 #endif  // GPU_IPC_SERVICE_PASS_THROUGH_IMAGE_TRANSPORT_SURFACE_H_