Don't destroy RenderWidgetCompositor during DoDeferredClose

cc/trees/thread_proxy.cc

Index: cc/trees/thread_proxy.cc
diff --git a/cc/trees/thread_proxy.cc b/cc/trees/thread_proxy.cc
index 4a95140226db8fd2c72da44e632ebdd880bf1f5e..1485c61e1756c4ab611242d68d19b5ea30b6f18c 100644
--- a/cc/trees/thread_proxy.cc
+++ b/cc/trees/thread_proxy.cc
@@ -80,7 +80,9 @@ ThreadProxy::MainThreadOnly::MainThreadOnly(ThreadProxy* proxy,
       manage_tiles_pending(false),
       can_cancel_commit(true),
       defer_commits(false),
-      weak_factory(proxy) {}
+      host_client_finished_(false),
+      weak_factory(proxy) {
+}
 
 ThreadProxy::MainThreadOnly::~MainThreadOnly() {}
 
@@ -155,6 +157,10 @@ void ThreadProxy::SetLayerTreeHostClientReady() {
                  impl_thread_weak_ptr_));
 }
 
+void ThreadProxy::SetLayerTreeHostClientFinished() {
+  main().host_client_finished_ = true;
+}
+
 void ThreadProxy::SetLayerTreeHostClientReadyOnImplThread() {
   TRACE_EVENT0("cc", "ThreadProxy::SetLayerTreeHostClientReadyOnImplThread");
   impl().scheduler->SetCanStart();
@@ -218,6 +224,9 @@ void ThreadProxy::CreateAndInitializeOutputSurface() {
   TRACE_EVENT0("cc", "ThreadProxy::DoCreateAndInitializeOutputSurface");
   DCHECK(IsMainThread());
 
+  if (main().host_client_finished_)
+    return;
+
   scoped_ptr<OutputSurface> output_surface =
       layer_tree_host()->CreateOutputSurface();