[cc] Show GPU memory usage and overage below FPS counter

cc/layer_tree_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/layer_tree_impl.h"
 
 #include "base/debug/trace_event.h"
 #include "cc/heads_up_display_layer_impl.h"
 #include "cc/layer_tree_host_common.h"
 #include "cc/layer_tree_host_impl.h"
@@ skipping 356 matching lines @@
 }
 
 FrameRateCounter* LayerTreeImpl::frame_rate_counter() const {
   return layer_tree_host_impl_->fpsCounter();
 }
 
 PaintTimeCounter* LayerTreeImpl::paint_time_counter() const {
   return layer_tree_host_impl_->paintTimeCounter();
 }
 
+MemoryHistory* LayerTreeImpl::memory_history() const {
+  return layer_tree_host_impl_->memoryHistory();
+}
+
 bool LayerTreeImpl::IsActiveTree() const {
   return layer_tree_host_impl_->activeTree() == this;
 }
 
 bool LayerTreeImpl::IsPendingTree() const {
   return layer_tree_host_impl_->pendingTree() == this;
 }
 
 bool LayerTreeImpl::IsRecycleTree() const {
   return layer_tree_host_impl_->recycleTree() == this;
@@ skipping 51 matching lines @@
 
 DebugRectHistory* LayerTreeImpl::debug_rect_history() const {
   return layer_tree_host_impl_->debugRectHistory();
 }
 
 AnimationRegistrar* LayerTreeImpl::animationRegistrar() const {
   return layer_tree_host_impl_->animationRegistrar();
 }
 
 } // namespace cc