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

content/common/gpu/image_transport_surface.cc

Index: content/common/gpu/image_transport_surface.cc
diff --git a/content/common/gpu/image_transport_surface.cc b/content/common/gpu/image_transport_surface.cc
index 9c9feeeca782b09cea144b0c3a70128772764f60..17a2fdf197f855dd1f90750cba358c353fe1020f 100644
--- a/content/common/gpu/image_transport_surface.cc
+++ b/content/common/gpu/image_transport_surface.cc
@@ -96,6 +96,10 @@ bool ImageTransportHelper::OnMessageReceived(const IPC::Message& message) {
                         OnPostSubBufferACK)
     IPC_MESSAGE_HANDLER(AcceleratedSurfaceMsg_NewACK,
                         OnNewSurfaceACK)
+    IPC_MESSAGE_HANDLER(AcceleratedSurfaceMsg_SetFrontSurfaceIsProtected,
+                        OnSetFrontSurfaceIsProtected)
+    IPC_MESSAGE_HANDLER(AcceleratedSurfaceMsg_RequestReleaseFrontACK,
+                        OnRequestReleaseFrontACK)
     IPC_MESSAGE_HANDLER(AcceleratedSurfaceMsg_ResizeViewACK, OnResizeViewACK);
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
@@ -139,6 +143,13 @@ void ImageTransportHelper::SendAcceleratedSurfaceRelease(
   manager_->Send(new GpuHostMsg_AcceleratedSurfaceRelease(params));
 }
 
+void ImageTransportHelper::SendAcceleratedSurfaceRequestReleaseFront(
+    GpuHostMsg_AcceleratedSurfaceRequestReleaseFront_Params params) {
+  params.surface_id = stub_->surface_id();
+  params.route_id = route_id_;
+  manager_->Send(new GpuHostMsg_AcceleratedSurfaceRequestReleaseFront(params));
+}
+
 void ImageTransportHelper::SendResizeView(const gfx::Size& size) {
   manager_->Send(new GpuHostMsg_ResizeView(stub_->surface_id(),
                                            route_id_,
@@ -196,6 +207,15 @@ void ImageTransportHelper::OnNewSurfaceACK(
   surface_->OnNewSurfaceACK(surface_handle, shm_handle);
 }
 
+void ImageTransportHelper::OnSetFrontSurfaceIsProtected(bool is_protected) {
+  surface_->OnSetFrontSurfaceIsProtected(is_protected);
+}
+
+void ImageTransportHelper::OnRequestReleaseFrontACK(
+    int request_id, int retry_count, bool was_released) {
+  surface_->OnRequestReleaseFrontACK(request_id, retry_count, was_released);
+}
+
 void ImageTransportHelper::OnBuffersSwappedACK() {
   surface_->OnBuffersSwappedACK();
 }
@@ -304,6 +324,14 @@ void PassThroughImageTransportSurface::OnNewSurfaceACK(
     TransportDIB::Handle shm_handle) {
 }
 
+void PassThroughImageTransportSurface::OnSetFrontSurfaceIsProtected(
+    bool is_protected) {
+}
+
+void PassThroughImageTransportSurface::OnRequestReleaseFrontACK(
+    int request_id, int retry_count, bool was_released) {
+}
+
 void PassThroughImageTransportSurface::OnBuffersSwappedACK() {
   DCHECK(transport_);
   helper_->SetScheduled(true);