Hook up BeginFrameSource to SurfaceFactoryClient via SurfaceManager

components/mus/ws/server_window_surface_manager.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 "components/mus/ws/server_window_surface_manager.h"
 
 #include "components/mus/ws/server_window.h"
 #include "components/mus/ws/server_window_delegate.h"
 #include "components/mus/ws/server_window_surface.h"
 
@@ skipping 16 matching lines @@
   waiting_for_initial_frames_ =
       !IsSurfaceReadyAndNonEmpty(mojom::SurfaceType::DEFAULT) ||
       !IsSurfaceReadyAndNonEmpty(mojom::SurfaceType::UNDERLAY);
   return !waiting_for_initial_frames_;
 }
 
 void ServerWindowSurfaceManager::CreateSurface(
     mojom::SurfaceType surface_type,
     mojo::InterfaceRequest<mojom::Surface> request,
     mojom::SurfaceClientPtr client) {
-  type_to_surface_map_[surface_type] = make_scoped_ptr(new ServerWindowSurface(
+  scoped_ptr<ServerWindowSurface> surface(new ServerWindowSurface(
       this, surface_type, std::move(request), std::move(client)));
+  if (!HasAnySurface()) {
+    // Only one SurfaceFactoryClient can be registered per surface id namespace,
+    // so register the first one.  Since all surfaces created by this manager
+    // represent the same window, the begin frame source can be shared by
+    // all surfaces created here.
+    surface->RegisterForBeginFrames();
+  }
+  type_to_surface_map_[surface_type] = std::move(surface);
 }
 
 ServerWindowSurface* ServerWindowSurfaceManager::GetDefaultSurface() {
   return GetSurfaceByType(mojom::SurfaceType::DEFAULT);
 }
 
 ServerWindowSurface* ServerWindowSurfaceManager::GetUnderlaySurface() {
   return GetSurfaceByType(mojom::SurfaceType::UNDERLAY);
 }
 
 ServerWindowSurface* ServerWindowSurfaceManager::GetSurfaceByType(
     mojom::SurfaceType type) {
   auto iter = type_to_surface_map_.find(type);
   return iter == type_to_surface_map_.end() ? nullptr : iter->second.get();
 }
 
-bool ServerWindowSurfaceManager::HasSurfaceOfType(mojom::SurfaceType type) {
+bool ServerWindowSurfaceManager::HasSurfaceOfType(
+    mojom::SurfaceType type) const {
   return type_to_surface_map_.count(type) > 0;
 }
 
+bool ServerWindowSurfaceManager::HasAnySurface() const {
+  return !GetDefaultSurface() && !GetUnderlaySurface();
+}
+
+SurfaceManager* ServerWindowSurfaceManager::GetSurfaceManager() {
+  return window()->delegate()->GetSurfacesState()->manager();
+}
+
 bool ServerWindowSurfaceManager::IsSurfaceReadyAndNonEmpty(
     mojom::SurfaceType type) const {
   auto iter = type_to_surface_map_.find(type);
   if (iter == type_to_surface_map_.end())
     return false;
   if (iter->second->last_submitted_frame_size().IsEmpty())
     return false;
   const gfx::Size& last_submitted_frame_size =
       iter->second->last_submitted_frame_size();
   return last_submitted_frame_size.width() >= window_->bounds().width() &&
          last_submitted_frame_size.height() >= window_->bounds().height();
 }
 
 cc::SurfaceId ServerWindowSurfaceManager::GenerateId() {
   return surface_id_allocator_.GenerateId();
 }
 
 }  // namespace ws
 }  // namespace mus