Drop frontbuffers with ui-use-gpu-process, synchronized with browser, decoupled from backbuffer dro…

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.
 
 #if defined(ENABLE_GPU)
 
 #include "content/common/gpu/image_transport_surface.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 78 matching lines @@
 
 bool ImageTransportHelper::OnMessageReceived(const IPC::Message& message) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(ImageTransportHelper, message)
     IPC_MESSAGE_HANDLER(AcceleratedSurfaceMsg_BuffersSwappedACK,
                         OnBuffersSwappedACK)
     IPC_MESSAGE_HANDLER(AcceleratedSurfaceMsg_PostSubBufferACK,
                         OnPostSubBufferACK)
     IPC_MESSAGE_HANDLER(AcceleratedSurfaceMsg_NewACK,
                         OnNewSurfaceACK)
+    IPC_MESSAGE_HANDLER(AcceleratedSurfaceMsg_DiscardSurface,
+                        OnDiscardSurface)
     IPC_MESSAGE_HANDLER(AcceleratedSurfaceMsg_ResizeViewACK, OnResizeViewACK);
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
 }
 
 void ImageTransportHelper::SendAcceleratedSurfaceNew(
     GpuHostMsg_AcceleratedSurfaceNew_Params params) {
   params.surface_id = stub_->surface_id();
   params.route_id = route_id_;
@@ skipping 23 matching lines @@
   manager_->Send(new GpuHostMsg_AcceleratedSurfacePostSubBuffer(params));
 }
 
 void ImageTransportHelper::SendAcceleratedSurfaceRelease(
     GpuHostMsg_AcceleratedSurfaceRelease_Params params) {
   params.surface_id = stub_->surface_id();
   params.route_id = route_id_;
   manager_->Send(new GpuHostMsg_AcceleratedSurfaceRelease(params));
 }
 
+void ImageTransportHelper::SendAcceleratedSurfaceSuggestDiscard(
+    GpuHostMsg_AcceleratedSurfaceSuggestDiscard_Params params) {
+  params.surface_id = stub_->surface_id();
+  params.route_id = route_id_;
+  manager_->Send(new GpuHostMsg_AcceleratedSurfaceSuggestDiscard(params));
+}
+
 void ImageTransportHelper::SendResizeView(const gfx::Size& size) {
   manager_->Send(new GpuHostMsg_ResizeView(stub_->surface_id(),
                                            route_id_,
                                            size));
 }
 
 void ImageTransportHelper::SetScheduled(bool is_scheduled) {
   gpu::GpuScheduler* scheduler = Scheduler();
   if (!scheduler)
     return;
@@ skipping 42 matching lines @@
     return NULL;
   return stub_->decoder();
 }
 
 void ImageTransportHelper::OnNewSurfaceACK(
     uint64 surface_handle,
     TransportDIB::Handle shm_handle) {
   surface_->OnNewSurfaceACK(surface_handle, shm_handle);
 }
 
+void ImageTransportHelper::OnDiscardSurface(
+    uint64 surface_id) {
+  surface_->OnDiscardSurface(surface_id);
+}
+
 void ImageTransportHelper::OnBuffersSwappedACK() {
   surface_->OnBuffersSwappedACK();
 }
 
 void ImageTransportHelper::OnPostSubBufferACK() {
   surface_->OnPostSubBufferACK();
 }
 
 void ImageTransportHelper::OnResizeViewACK() {
   surface_->OnResizeViewACK();
@@ skipping 84 matching lines @@
     did_set_swap_interval_ = true;
   }
   return true;
 }
 
 void PassThroughImageTransportSurface::OnNewSurfaceACK(
     uint64 surface_handle,
     TransportDIB::Handle shm_handle) {
 }
 
+void PassThroughImageTransportSurface::OnDiscardSurface(
+    uint64 surface_id) {
+}
+
 void PassThroughImageTransportSurface::OnBuffersSwappedACK() {
   DCHECK(transport_);
   helper_->SetScheduled(true);
 }
 
 void PassThroughImageTransportSurface::OnPostSubBufferACK() {
   DCHECK(transport_);
   helper_->SetScheduled(true);
 }
 
@@ skipping 11 matching lines @@
     helper_->SendResizeView(size);
     helper_->SetScheduled(false);
   } else {
     Resize(new_size_);
   }
 }
 
 PassThroughImageTransportSurface::~PassThroughImageTransportSurface() {}
 
 #endif  // defined(ENABLE_GPU)