WIP: Plumbing input event latency reporting through Mus GPU.

services/ui/surfaces/display_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 SERVICES_UI_SURFACES_DISPLAY_OUTPUT_SURFACE_H_
 #define SERVICES_UI_SURFACES_DISPLAY_OUTPUT_SURFACE_H_
 
 #include <memory>
 
 #include "cc/output/in_process_context_provider.h"
 #include "cc/output/output_surface.h"
 
 namespace cc {
 class SyntheticBeginFrameSource;
 }
 
+namespace latency_tracker {
+class LatencyTracker;
+}
+
 namespace ui {
 
 // An OutputSurface implementation that directly draws and
 // swaps to an actual GL surface.
 class DisplayOutputSurface : public cc::OutputSurface {
  public:
   DisplayOutputSurface(
       scoped_refptr<cc::InProcessContextProvider> context_provider,
       cc::SyntheticBeginFrameSource* synthetic_begin_frame_source);
   ~DisplayOutputSurface() override;
@@ skipping 18 matching lines @@
   bool HasExternalStencilTest() const override;
   void ApplyExternalStencil() override;
 
  protected:
   cc::OutputSurfaceClient* client() const { return client_; }
 
   // Called when a swap completion is signaled from ImageTransportSurface.
   virtual void DidReceiveSwapBuffersAck(gfx::SwapResult result);
 
  private:
+  cc::InProcessContextProvider* in_process_context_provider() {

[mfomitchev, 2017/03/24 20:55:58]

How about this?

+    return static_cast<cc::InProcessContextProvider*>(context_provider());
+  }
+
   // Called when a swap completion is signaled from ImageTransportSurface.
   void OnGpuSwapBuffersCompleted(
       const std::vector<ui::LatencyInfo>& latency_info,
       gfx::SwapResult result,
       const gpu::GpuProcessHostedCALayerTreeParamsMac* params_mac);
   void OnVSyncParametersUpdated(base::TimeTicks timebase,
                                 base::TimeDelta interval);
 
   cc::OutputSurfaceClient* client_ = nullptr;
   cc::SyntheticBeginFrameSource* const synthetic_begin_frame_source_;
+  std::unique_ptr<latency_tracker::LatencyTracker> latency_tracker_;
+
   bool set_draw_rectangle_for_frame_ = false;
   // True if the draw rectangle has been set at all since the last resize.
   bool has_set_draw_rectangle_since_last_resize_ = false;
   gfx::Size size_;
 
   base::WeakPtrFactory<DisplayOutputSurface> weak_ptr_factory_;
 };
 
 }  // namespace ui
 
 #endif  // SERVICES_UI_SURFACES_DISPLAY_OUTPUT_SURFACE_H_