Plumb cc::LatencyInfo through command buffer and output surface

content/common/gpu/image_transport_surface_mac.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 "content/common/gpu/image_transport_surface.h"
 
 #include "base/mac/scoped_cftyperef.h"
 #include "base/memory/scoped_ptr.h"
 #include "content/common/gpu/gpu_messages.h"
 #include "ui/gfx/native_widget_types.h"
@@ skipping 42 matching lines @@
   virtual unsigned int GetBackingFrameBufferObject() OVERRIDE;
   virtual bool SetBackbufferAllocation(bool allocated) OVERRIDE;
   virtual void SetFrontbufferAllocation(bool allocated) OVERRIDE;
 
  protected:
   // ImageTransportSurface implementation
   virtual void OnBufferPresented(
       const AcceleratedSurfaceMsg_BufferPresented_Params& params) OVERRIDE;
   virtual void OnResizeViewACK() OVERRIDE;
   virtual void OnResize(gfx::Size size) OVERRIDE;
+  virtual void SetLatencyInfo(const cc::LatencyInfo&) OVERRIDE;
 
  private:
   virtual ~IOSurfaceImageTransportSurface() OVERRIDE;
 
   void AdjustBufferAllocation();
   void UnrefIOSurface();
   void CreateIOSurface();
 
   // Tracks the current buffer allocation state.
   bool backbuffer_suggested_allocation_;
@@ skipping 217 matching lines @@
   TRACE_EVENT2("gpu", "IOSurfaceImageTransportSurface::OnResize",
                "old_width", size_.width(), "new_width", size.width());
   // Caching |context_| from OnMakeCurrent. It should still be current.
   DCHECK(context_->IsCurrent(this));
 
   size_ = size;
 
   CreateIOSurface();
 }
 
+void IOSurfaceImageTransportSurface::SetLatencyInfo(
+    const cc::LatencyInfo&) {
+  // TODO: implement

[piman, 2013/04/03 18:05:09]

Is there anything to do here beyond keeping it around and sending it with the
GpuHostMsg_AcceleratedSurfaceBuffersSwapped_Params message?

+}
+
 void IOSurfaceImageTransportSurface::UnrefIOSurface() {
   // If we have resources to destroy, then make sure that we have a current
   // context which we can use to delete the resources.
   if (context_ || fbo_id_ || texture_id_) {
     DCHECK(gfx::GLContext::GetCurrent() == context_);
     DCHECK(context_->IsCurrent(this));
     DCHECK(CGLGetCurrentContext());
   }
 
   if (fbo_id_) {
@@ skipping 158 matching lines @@
           manager, stub, surface.get(), false));
   }
 }
 
 // static
 void ImageTransportSurface::SetAllowOSMesaForTesting(bool allow) {
   g_allow_os_mesa = allow;
 }
 
 }  // namespace content