Display Compositor: Allocate LocalFrameId in client.

services/ui/public/cpp/window_compositor_frame_sink.cc

 // Copyright 2014 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/public/cpp/window_compositor_frame_sink.h"
 
 #include "base/bind.h"
 #include "cc/output/compositor_frame.h"
 #include "cc/output/compositor_frame_sink_client.h"
 #include "gpu/ipc/client/gpu_channel_host.h"
@@ skipping 47 matching lines @@
   compositor_frame_sink_.reset();
   cc::CompositorFrameSink::DetachFromClient();
 }
 
 void WindowCompositorFrameSink::SubmitCompositorFrame(
     cc::CompositorFrame frame) {
   DCHECK(thread_checker_);
   DCHECK(thread_checker_->CalledOnValidThread());
   if (!compositor_frame_sink_)
     return;
-  compositor_frame_sink_->SubmitCompositorFrame(std::move(frame));
+
+  gfx::Size frame_size = last_submitted_frame_size_;
+  if (!frame.render_pass_list.empty())
+    frame_size = frame.render_pass_list[0]->output_rect.size();
+  if (!local_frame_id_.is_valid() || frame_size != last_submitted_frame_size_)
+    local_frame_id_ = id_allocator_.GenerateId();
+
+  compositor_frame_sink_->SubmitCompositorFrame(local_frame_id_,
+                                                std::move(frame));
+
+  last_submitted_frame_size_ = frame_size;
 }
 
 WindowCompositorFrameSink::WindowCompositorFrameSink(
     scoped_refptr<cc::ContextProvider> context_provider,
     gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager,
     mojo::InterfacePtrInfo<cc::mojom::MojoCompositorFrameSink>
         compositor_frame_sink_info,
     cc::mojom::MojoCompositorFrameSinkClientRequest client_request)
     : cc::CompositorFrameSink(std::move(context_provider),
                               nullptr,
@@ skipping 31 matching lines @@
 WindowCompositorFrameSinkBinding::~WindowCompositorFrameSinkBinding() {}
 
 WindowCompositorFrameSinkBinding::WindowCompositorFrameSinkBinding(
     cc::mojom::MojoCompositorFrameSinkRequest compositor_frame_sink_request,
     mojo::InterfacePtrInfo<cc::mojom::MojoCompositorFrameSinkClient>
         compositor_frame_sink_client)
     : compositor_frame_sink_request_(std::move(compositor_frame_sink_request)),
       compositor_frame_sink_client_(std::move(compositor_frame_sink_client)) {}
 
 }  // namespace ui