cc:: Add RenderingStatsInstrumentation to manage collection of RenderingStats

cc/test/fake_layer_tree_host_impl.cc

 // Copyright 2012 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/test/fake_layer_tree_host_impl.h"
 
 namespace cc {
 
 FakeLayerTreeHostImpl::FakeLayerTreeHostImpl(Proxy* proxy)
-    : LayerTreeHostImpl(LayerTreeSettings(), &client_, proxy) {
+    : rendering_stats_instrumentation_(RenderingStatsInstrumentation::Create()),

[tapted, 2013/03/21 02:27:22]

sheriff drive-by: I'm .. pretty sure the compiler will reorder these so the base
class will be initialized first, with an invalid pointer. 

+      LayerTreeHostImpl(LayerTreeSettings(),
+                        &client_,
+                        proxy,
+                        rendering_stats_instrumentation_.get())
+{
   // Explicitly clear all debug settings.
   SetDebugState(LayerTreeDebugState());
 }
 
 FakeLayerTreeHostImpl::FakeLayerTreeHostImpl(
     const LayerTreeSettings& settings,
     Proxy* proxy)
-    : LayerTreeHostImpl(settings, &client_, proxy) {
+    : rendering_stats_instrumentation_(RenderingStatsInstrumentation::Create()),
+      LayerTreeHostImpl(settings,
+                        &client_,
+                        proxy,
+                        rendering_stats_instrumentation_.get())
+{
   // Explicitly clear all debug settings.
   SetDebugState(LayerTreeDebugState());
 }
 
 FakeLayerTreeHostImpl::~FakeLayerTreeHostImpl() {}
 
 }  // namespace cc