Finish offscreen canvas using FrameSinkMangerHost.

content/browser/renderer_host/offscreen_canvas_compositor_frame_sink_manager.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_compositor_frame_sink_manager.h"
-
-#include "base/lazy_instance.h"
-#include "cc/surfaces/surface_manager.h"
-#include "content/browser/compositor/surface_utils.h"
-
-namespace content {
-
-namespace {
-base::LazyInstance<OffscreenCanvasCompositorFrameSinkManager>::Leaky g_manager =
-    LAZY_INSTANCE_INITIALIZER;
-}
-
-OffscreenCanvasCompositorFrameSinkManager::
-    OffscreenCanvasCompositorFrameSinkManager() {
-  GetSurfaceManager()->AddObserver(this);
-}
-
-OffscreenCanvasCompositorFrameSinkManager::
-    ~OffscreenCanvasCompositorFrameSinkManager() {
-  registered_surface_instances_.clear();
-  GetSurfaceManager()->RemoveObserver(this);
-}
-
-OffscreenCanvasCompositorFrameSinkManager*
-OffscreenCanvasCompositorFrameSinkManager::GetInstance() {
-  return g_manager.Pointer();
-}
-
-void OffscreenCanvasCompositorFrameSinkManager::OnSurfaceCreated(
-    const cc::SurfaceInfo& surface_info) {
-  auto surface_iter =
-      registered_surface_instances_.find(surface_info.id().frame_sink_id());
-  if (surface_iter == registered_surface_instances_.end())
-    return;
-  OffscreenCanvasSurfaceImpl* surface_impl = surface_iter->second;
-  surface_impl->OnSurfaceCreated(surface_info);
-}
-
-void OffscreenCanvasCompositorFrameSinkManager::
-    RegisterOffscreenCanvasSurfaceInstance(
-        const cc::FrameSinkId& frame_sink_id,
-        OffscreenCanvasSurfaceImpl* surface_instance) {
-  DCHECK(surface_instance);
-  DCHECK_EQ(registered_surface_instances_.count(frame_sink_id), 0u);
-  registered_surface_instances_[frame_sink_id] = surface_instance;
-}
-
-void OffscreenCanvasCompositorFrameSinkManager::
-    UnregisterOffscreenCanvasSurfaceInstance(
-        const cc::FrameSinkId& frame_sink_id) {
-  DCHECK_EQ(registered_surface_instances_.count(frame_sink_id), 1u);
-  registered_surface_instances_.erase(frame_sink_id);
-}
-
-OffscreenCanvasSurfaceImpl*
-OffscreenCanvasCompositorFrameSinkManager::GetSurfaceInstance(
-    const cc::FrameSinkId& frame_sink_id) {
-  auto search = registered_surface_instances_.find(frame_sink_id);
-  if (search != registered_surface_instances_.end()) {
-    return search->second;
-  }
-  return nullptr;
-}
-
-}  // namespace content