cc: Setup API to release OutputSurface from LTHClient.

cc/trees/layer_tree_host_impl.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/layer_tree_host_impl.h"
 
 #include <algorithm>
 #include <limits>
 #include <map>
 #include <set>
@@ skipping 2176 matching lines @@
 }
 
 void LayerTreeHostImpl::CleanUpTileManager() {
   tile_manager_->FinishTasksAndCleanUp();
   resource_pool_ = nullptr;
   staging_resource_pool_ = nullptr;
   tile_task_worker_pool_ = nullptr;
   single_thread_synchronous_task_graph_runner_ = nullptr;
 }
 
+scoped_ptr<OutputSurface> LayerTreeHostImpl::GetOutputSurface() {
+  return output_surface_.Pass();

[no sievers, 2015/09/10 00:00:22]

|renderer_| and |resource_provider_| still have pointers to the underlying
context. You could move the tear-down code from InitializeRenderer() into here,
and then call ReleaseOutputSurface() from InitializeRenderer().

[sohanjg, 2015/09/10 15:07:23]

Done.

+}
+
 bool LayerTreeHostImpl::InitializeRenderer(
     scoped_ptr<OutputSurface> output_surface) {
   TRACE_EVENT0("cc", "LayerTreeHostImpl::InitializeRenderer");
 
   // Since we will create a new resource provider, we cannot continue to use
   // the old resources (i.e. render_surfaces and texture IDs). Clear them
   // before we destroy the old resource provider.
   ReleaseTreeResources();
 
   // Note: order is important here.
@@ skipping 1425 matching lines @@
   if (active_tree()) {
     LayerAnimationValueProvider* layer = active_tree()->LayerById(layer_id);
     if (layer)
       return layer->ScrollOffsetForAnimation();
   }
 
   return gfx::ScrollOffset();
 }
 
 }  // namespace cc