Fix race conditions in window snapshot code.

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/output/context_provider.h"
 #include "cc/output/output_surface.h"
@@ skipping 230 matching lines @@
 }
 
 void SingleThreadProxy::SetNeedsRedraw(gfx::Rect damage_rect) {
   SetNeedsRedrawRectOnImplThread(damage_rect);
 }
 
 void SingleThreadProxy::SetNextCommitWaitsForActivation() {
   // There is no activation here other than commit. So do nothing.
 }
 
+void SingleThreadProxy::SetNextCommitForcesRedraw() {
+  layer_tree_host_impl_->SetFullRootLayerDamage();
+}
+
 void SingleThreadProxy::SetDeferCommits(bool defer_commits) {
   // Thread-only feature.
   NOTREACHED();
 }
 
 bool SingleThreadProxy::CommitRequested() const { return false; }
 
 size_t SingleThreadProxy::MaxPartialTextureUpdates() const {
   return std::numeric_limits<size_t>::max();
 }
@@ skipping 240 matching lines @@
 void SingleThreadProxy::DidSwapFrame() {
   if (next_frame_is_newly_committed_frame_) {
     next_frame_is_newly_committed_frame_ = false;
     layer_tree_host_->DidCommitAndDrawFrame();
   }
 }
 
 bool SingleThreadProxy::CommitPendingForTesting() { return false; }
 
 }  // namespace cc