Add/remove surface references via MojoCompositorFrameSink.

services/ui/surfaces/gpu_compositor_frame_sink.cc

 // Copyright 2015 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 "services/ui/surfaces/gpu_compositor_frame_sink.h"
 
 #include "base/callback.h"
 #include "base/message_loop/message_loop.h"
 #include "base/single_thread_task_runner.h"
 #include "base/threading/thread_task_runner_handle.h"
@@ skipping 79 matching lines @@
   surface_factory_.SubmitCompositorFrame(
       local_frame_id_, std::move(frame),
       base::Bind(&GpuCompositorFrameSink::DidReceiveCompositorFrameAck,
                  weak_factory_.GetWeakPtr()));
   if (display_) {
     display_->SetLocalFrameId(local_frame_id_,
                               frame.metadata.device_scale_factor);
   }
 }
 
+void GpuCompositorFrameSink::AddSurfaceReferences(
+    const std::vector<cc::SurfaceReference>& references) {
+  for (auto& ref : references)
+    display_compositor_->AddSurfaceReference(ref);

[Fady Samuel, 2016/12/04 23:30:12]

I'd love to see this added to CompositorFrameSinkSupport. I think we might need
a display compositor support to make that happen.

If we do that then we can start looking into transitioning ui::Compositor away
from SurfaceSequences *I think*.

[kylechar, 2016/12/05 20:26:45]

CompositorFrameSinkSupport doesn't have access to DisplayCompositor, is that
what you mean?

+}
+
+void GpuCompositorFrameSink::RemoveSurfaceReferences(
+    const std::vector<cc::SurfaceReference>& references) {
+  for (auto& ref : references)
+    display_compositor_->RemoveSurfaceReference(ref);
+}
+
 void GpuCompositorFrameSink::DidReceiveCompositorFrameAck() {
   if (!client_)
     return;
   client_->DidReceiveCompositorFrameAck();
   DCHECK_GT(ack_pending_count_, 0);
   if (!surface_returned_resources_.empty()) {
     client_->ReclaimResources(surface_returned_resources_);
     surface_returned_resources_.clear();
   }
   ack_pending_count_--;
@@ skipping 126 matching lines @@
 }
 
 void GpuCompositorFrameSink::OnPrivateConnectionLost() {
   private_connection_lost_ = true;
   // Request destruction of |this| only if both connections are lost.
   display_compositor_->OnCompositorFrameSinkPrivateConnectionLost(
       frame_sink_id_, client_connection_lost_);
 }
 
 }  // namespace ui