Remove GpuHostMsg_FrameDrawn and replace with client channel swap ack

content/common/gpu/image_transport_surface.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/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
@@ skipping 95 matching lines @@
   manager_->Send(new GpuHostMsg_AcceleratedSurfaceBuffersSwapped(params));
 }
 
 void ImageTransportHelper::SendUpdateVSyncParameters(
       base::TimeTicks timebase, base::TimeDelta interval) {
   manager_->Send(new GpuHostMsg_UpdateVSyncParameters(stub_->surface_id(),
                                                       timebase,
                                                       interval));
 }
 
 void ImageTransportHelper::SendLatencyInfo(

[piman, 2014/10/07 02:30:39]

nit: maybe we should rename this as SwapBuffersCompleted or something. It's not
clear without looking at PassThroughImageTransportSurface why this is the
swapbuffers ack.

[no sievers, 2014/10/07 19:47:24]

Done.

     const std::vector<ui::LatencyInfo>& latency_info) {
-  manager_->Send(new GpuHostMsg_FrameDrawn(latency_info));
+  stub_->SwapBuffersCompleted(latency_info);
 }
 
 void ImageTransportHelper::SetScheduled(bool is_scheduled) {
   gpu::GpuScheduler* scheduler = Scheduler();
   if (!scheduler)
     return;
 
   scheduler->SetScheduled(is_scheduled);
 }
 
@@ skipping 157 matching lines @@
 void PassThroughImageTransportSurface::SendVSyncUpdateIfAvailable() {
   gfx::VSyncProvider* vsync_provider = GetVSyncProvider();
   if (vsync_provider) {
     vsync_provider->GetVSyncParameters(
       base::Bind(&ImageTransportHelper::SendUpdateVSyncParameters,
                  helper_->AsWeakPtr()));
   }
 }
 
 }  // namespace content