Make Surface creation lazy for OffscreenCanvasFrameReceiverImpl

content/browser/renderer_host/offscreen_canvas_surface_impl.cc

 // Copyright 2016 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 "content/browser/renderer_host/offscreen_canvas_surface_impl.h"
 
 #include "base/bind_helpers.h"
 #include "cc/surfaces/surface.h"
 #include "cc/surfaces/surface_manager.h"
 #include "content/browser/compositor/surface_utils.h"
 #include "content/public/browser/browser_thread.h"
 
 namespace content {
 
 // static
 void OffscreenCanvasSurfaceImpl::Create(
     mojo::InterfaceRequest<blink::mojom::OffscreenCanvasSurface> request) {
   // |binding_| will take ownership of OffscreenCanvasSurfaceImpl
   new OffscreenCanvasSurfaceImpl(std::move(request));
 }
 
 OffscreenCanvasSurfaceImpl::OffscreenCanvasSurfaceImpl(
     mojo::InterfaceRequest<blink::mojom::OffscreenCanvasSurface> request)
     : id_allocator_(new cc::SurfaceIdAllocator(AllocateSurfaceClientId())),
       binding_(this, std::move(request)) {
-  GetSurfaceManager()->RegisterSurfaceClientId(id_allocator_->client_id());
 }
 
 OffscreenCanvasSurfaceImpl::~OffscreenCanvasSurfaceImpl() {
-  if (!GetSurfaceManager()) {
-    // Inform both members that SurfaceManager's no longer alive to
-    // avoid their destruction errors.
-    if (surface_factory_)
-        surface_factory_->DidDestroySurfaceManager();
-  } else {
-    GetSurfaceManager()->InvalidateSurfaceClientId(id_allocator_->client_id());
-  }
-  surface_factory_->Destroy(surface_id_);
 }
 
 void OffscreenCanvasSurfaceImpl::GetSurfaceId(
     const GetSurfaceIdCallback& callback) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 
   surface_id_ = id_allocator_->GenerateId();
 
   callback.Run(surface_id_);
 }
 
-void OffscreenCanvasSurfaceImpl::RequestSurfaceCreation(
-    const cc::SurfaceId& surface_id) {
-  cc::SurfaceManager* manager = GetSurfaceManager();
-  if (!surface_factory_) {
-    surface_factory_ = base::MakeUnique<cc::SurfaceFactory>(manager, this);
-  }
-  surface_factory_->Create(surface_id);
-}
-
 void OffscreenCanvasSurfaceImpl::Require(const cc::SurfaceId& surface_id,
                                          const cc::SurfaceSequence& sequence) {
   cc::SurfaceManager* manager = GetSurfaceManager();
   cc::Surface* surface = manager->GetSurfaceForId(surface_id);
   if (!surface) {
     DLOG(ERROR) << "Attempting to require callback on nonexistent surface";
     return;
   }
   surface->AddDestructionDependency(sequence);
 }
 
 void OffscreenCanvasSurfaceImpl::Satisfy(const cc::SurfaceSequence& sequence) {
   std::vector<uint32_t> sequences;
   sequences.push_back(sequence.sequence);
   cc::SurfaceManager* manager = GetSurfaceManager();
   manager->DidSatisfySequences(sequence.client_id, &sequences);
 }
 
-// TODO(619136): Implement cc::SurfaceFactoryClient functions for resources
-// return.
-void OffscreenCanvasSurfaceImpl::ReturnResources(
-    const cc::ReturnedResourceArray& resources) {}
-
-void OffscreenCanvasSurfaceImpl::WillDrawSurface(const cc::SurfaceId& id,
-                                                 const gfx::Rect& damage_rect) {
-}
-
-void OffscreenCanvasSurfaceImpl::SetBeginFrameSource(
-    cc::BeginFrameSource* begin_frame_source) {}
-
 }  // namespace content