Update from https://crrev.com/317530

cc/trees/layer_tree_host.h

 // 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.
 
 #ifndef CC_TREES_LAYER_TREE_HOST_H_
 #define CC_TREES_LAYER_TREE_HOST_H_
 
 #include <limits>
 #include <set>
 #include <string>
@@ skipping 95 matching lines @@
       scoped_refptr<base::SingleThreadTaskRunner> main_task_runner,
       scoped_ptr<BeginFrameSource> external_begin_frame_source);
   virtual ~LayerTreeHost();
 
   void SetLayerTreeHostClientReady();
 
   // LayerTreeHost interface to Proxy.
   void WillBeginMainFrame();
   void DidBeginMainFrame();
   void BeginMainFrame(const BeginFrameArgs& args);
+  void BeginMainFrameNotExpectedSoon();
   void AnimateLayers(base::TimeTicks monotonic_frame_begin_time);
   void DidStopFlinging();
   void Layout();
   void BeginCommitOnImplThread(LayerTreeHostImpl* host_impl);
   void FinishCommitOnImplThread(LayerTreeHostImpl* host_impl);
   void WillCommit();
   void CommitComplete();
   void SetOutputSurface(scoped_ptr<OutputSurface> output_surface);
   void RequestNewOutputSurface();
   void DidInitializeOutputSurface();
@@ skipping 314 matching lines @@
   scoped_ptr<AnimationRegistrar> animation_registrar_;
 
   scoped_ptr<PendingPageScaleAnimation> pending_page_scale_animation_;
 
   // If set, then page scale animation has completed, but the client hasn't been
   // notified about it yet.
   bool did_complete_scale_animation_;
 
   bool in_paint_layer_contents_;
 
-  static const int kTotalFramesToUseForLCDTextMetrics = 50;
-  int total_frames_used_for_lcd_text_metrics_;
-
-  struct LCDTextMetrics {
-    LCDTextMetrics()
-        : total_num_cc_layers(0),
-          total_num_cc_layers_can_use_lcd_text(0),
-          total_num_cc_layers_will_use_lcd_text(0) {}
-
-    int64 total_num_cc_layers;
-    int64 total_num_cc_layers_can_use_lcd_text;
-    int64 total_num_cc_layers_will_use_lcd_text;
-  };
-  LCDTextMetrics lcd_text_metrics_;
   int id_;
   bool next_commit_forces_redraw_;
 
   scoped_refptr<Layer> overscroll_elasticity_layer_;
   scoped_refptr<Layer> page_scale_layer_;
   scoped_refptr<Layer> inner_viewport_scroll_layer_;
   scoped_refptr<Layer> outer_viewport_scroll_layer_;
 
   LayerSelectionBound selection_start_;
   LayerSelectionBound selection_end_;
 
   SharedBitmapManager* shared_bitmap_manager_;
   gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager_;
 
   ScopedPtrVector<SwapPromise> swap_promise_list_;
   std::set<SwapPromiseMonitor*> swap_promise_monitor_;
 
   uint32_t surface_id_namespace_;
   uint32_t next_surface_sequence_;
 
   DISALLOW_COPY_AND_ASSIGN(LayerTreeHost);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_HOST_H_