Don't destroy RenderWidgetCompositor during DoDeferredClose

cc/trees/single_thread_proxy.cc

 // Copyright 2011 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 "cc/trees/single_thread_proxy.h"
 
 #include "base/auto_reset.h"
 #include "base/debug/trace_event.h"
 #include "cc/debug/benchmark_instrumentation.h"
 #include "cc/output/context_provider.h"
@@ skipping 25 matching lines @@
     scoped_refptr<base::SingleThreadTaskRunner> main_task_runner)
     : Proxy(main_task_runner, NULL),
       layer_tree_host_(layer_tree_host),
       client_(client),
       timing_history_(layer_tree_host->rendering_stats_instrumentation()),
       next_frame_is_newly_committed_frame_(false),
       inside_draw_(false),
       defer_commits_(false),
       commit_was_deferred_(false),
       commit_requested_(false),
+      host_client_finished_(false),
       weak_factory_(this) {
   TRACE_EVENT0("cc", "SingleThreadProxy::SingleThreadProxy");
   DCHECK(Proxy::IsMainThread());
   DCHECK(layer_tree_host);
 
   // Impl-side painting not supported without threaded compositing.
   CHECK(!layer_tree_host->settings().impl_side_painting)
       << "Threaded compositing must be enabled to use impl-side painting.";
 }
 
@@ skipping 34 matching lines @@
     SchedulerSettings scheduler_settings(layer_tree_host_->settings());
     scheduler_on_impl_thread_ = Scheduler::Create(this,
                                                   scheduler_settings,
                                                   layer_tree_host_->id(),
                                                   MainThreadTaskRunner());
     scheduler_on_impl_thread_->SetCanStart();
     scheduler_on_impl_thread_->SetVisible(layer_tree_host_impl_->visible());
   }
 }
 
+void SingleThreadProxy::SetLayerTreeHostClientFinished() {
+  DCHECK(Proxy::IsMainThread());
+  host_client_finished_ = true;
+}
+
 void SingleThreadProxy::SetVisible(bool visible) {
   TRACE_EVENT0("cc", "SingleThreadProxy::SetVisible");
   DebugScopedSetImplThread impl(this);
   layer_tree_host_impl_->SetVisible(visible);
   if (scheduler_on_impl_thread_)
     scheduler_on_impl_thread_->SetVisible(layer_tree_host_impl_->visible());
   // Changing visibility could change ShouldComposite().
   UpdateBackgroundAnimateTicking();
 }
 
 void SingleThreadProxy::CreateAndInitializeOutputSurface() {
   TRACE_EVENT0(
       "cc", "SingleThreadProxy::CreateAndInitializeOutputSurface");
   DCHECK(Proxy::IsMainThread());
   DCHECK(layer_tree_host_->output_surface_lost());
 
+  // TODO(enne): in the future this could get handled by asynchronous
+  // output surface creation where the host client could just decline
+  // to ever create a surface when shutting down.
+  if (host_client_finished_)
+    return;
+
   scoped_ptr<OutputSurface> output_surface =
       layer_tree_host_->CreateOutputSurface();
 
   renderer_capabilities_for_main_thread_ = RendererCapabilities();
 
   bool success = !!output_surface;
   if (success) {
     DebugScopedSetMainThreadBlocked main_thread_blocked(this);
     DebugScopedSetImplThread impl(this);
     layer_tree_host_->DeleteContentsTexturesOnImplThread(
@@ skipping 571 matching lines @@
 
 base::TimeDelta SingleThreadProxy::CommitToActivateDurationEstimate() {
   return timing_history_.CommitToActivateDurationEstimate();
 }
 
 void SingleThreadProxy::DidBeginImplFrameDeadline() {
   layer_tree_host_impl_->ResetCurrentBeginFrameArgsForNextFrame();
 }
 
 }  // namespace cc