Move frame_sink_id management to framesink_manager.cc/h from

services/ui/surfaces/display_compositor.cc

Index: services/ui/surfaces/display_compositor.cc
diff --git a/services/ui/surfaces/display_compositor.cc b/services/ui/surfaces/display_compositor.cc
index 6c922fdde40d268ade043f6d4cc334a515bed69a..a06aeba2e91557dafefa6da0f717870b6d192048 100644
--- a/services/ui/surfaces/display_compositor.cc
+++ b/services/ui/surfaces/display_compositor.cc
@@ -36,6 +36,7 @@ DisplayCompositor::DisplayCompositor(
     cc::mojom::DisplayCompositorRequest request,
     cc::mojom::DisplayCompositorClientPtr client)
     : manager_(cc::SurfaceManager::LifetimeType::REFERENCES),
+      framesink_manager_(),
       gpu_service_(std::move(gpu_service)),
       gpu_memory_buffer_manager_(std::move(gpu_memory_buffer_manager)),
       image_factory_(image_factory),
@@ -88,8 +89,8 @@ void DisplayCompositor::CreateDisplayCompositorFrameSink(
 
   compositor_frame_sinks_[frame_sink_id] =
       base::MakeUnique<display_compositor::GpuDisplayCompositorFrameSink>(
-          this, &manager_, frame_sink_id, std::move(display),
-          std::move(begin_frame_source), std::move(request),
+          this, &manager_,&framesink_manager_, frame_sink_id,
+          std::move(display), std::move(begin_frame_source), std::move(request),
           std::move(private_request), std::move(client),
           std::move(display_private_request));
 }
@@ -104,8 +105,8 @@ void DisplayCompositor::CreateOffscreenCompositorFrameSink(
 
   compositor_frame_sinks_[frame_sink_id] =
       base::MakeUnique<display_compositor::GpuOffscreenCompositorFrameSink>(
-          this, &manager_, frame_sink_id, std::move(request),
-          std::move(private_request), std::move(client));
+          this, &manager_,&framesink_manager_, frame_sink_id,
+          std::move(request), std::move(private_request), std::move(client));
 }
 
 std::unique_ptr<cc::Display> DisplayCompositor::CreateDisplay(