Make cc::Display not own its BeginFrameSource

cc/surfaces/display.cc

Index: cc/surfaces/display.cc
diff --git a/cc/surfaces/display.cc b/cc/surfaces/display.cc
index 6d024e562fb27a0df7091e68a4feb1eb452d75ee..b326a78c4f6902ba36d1a8f06ab8ad5824ac2a78 100644
--- a/cc/surfaces/display.cc
+++ b/cc/surfaces/display.cc
@@ -33,14 +33,14 @@ namespace cc {
 Display::Display(SharedBitmapManager* bitmap_manager,
                  gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager,
                  const RendererSettings& settings,
-                 std::unique_ptr<BeginFrameSource> begin_frame_source,
+                 BeginFrameSource* begin_frame_source,
                  std::unique_ptr<OutputSurface> output_surface,
                  std::unique_ptr<DisplayScheduler> scheduler,
                  std::unique_ptr<TextureMailboxDeleter> texture_mailbox_deleter)
     : bitmap_manager_(bitmap_manager),
       gpu_memory_buffer_manager_(gpu_memory_buffer_manager),
       settings_(settings),
-      begin_frame_source_(std::move(begin_frame_source)),
+      begin_frame_source_(begin_frame_source),
       output_surface_(std::move(output_surface)),
       scheduler_(std::move(scheduler)),
       texture_mailbox_deleter_(std::move(texture_mailbox_deleter)) {
@@ -54,7 +54,7 @@ Display::~Display() {
   // Only do this if Initialize() happened.
   if (client_) {
     if (begin_frame_source_)
-      surface_manager_->UnregisterBeginFrameSource(begin_frame_source_.get());
+      surface_manager_->UnregisterBeginFrameSource(begin_frame_source_);
     surface_manager_->RemoveObserver(this);
   }
   if (aggregator_) {
@@ -80,7 +80,7 @@ void Display::Initialize(DisplayClient* client,
   // This must be done in Initialize() so that the caller can delay this until
   // they are ready to receive a BeginFrameSource.
   if (begin_frame_source_) {
-    surface_manager_->RegisterBeginFrameSource(begin_frame_source_.get(),
+    surface_manager_->RegisterBeginFrameSource(begin_frame_source_,
                                                compositor_surface_namespace_);
   }