cc: Remove fixed raster scale, stop rasterizing with will-change.

cc/trees/layer_tree_host_impl.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_IMPL_H_
 #define CC_TREES_LAYER_TREE_HOST_IMPL_H_
 
 #include <stddef.h>
 
 #include <bitset>
@@ skipping 601 matching lines @@
                                        ScrollNode* scroll_node) const;
 
   // Returns true if a scroll offset animation is created and false if we scroll
   // by the desired amount without an animation.
   bool ScrollAnimationCreate(ScrollNode* scroll_node,
                              const gfx::Vector2dF& scroll_amount);
 
   void SetLayerTreeMutator(std::unique_ptr<LayerTreeMutator> mutator);
   LayerTreeMutator* mutator() { return mutator_.get(); }
 
-  void set_fixed_raster_scale_has_blurry_content() {
-    has_fixed_raster_scale_blurry_content_ = true;
-  }
-  bool has_fixed_raster_scale_blurry_content() const {
-    return has_fixed_raster_scale_blurry_content_;
-  }
-
-  bool HasFixedRasterScalePotentialPerformanceRegression() const;
-  void SetFixedRasterScaleAttemptedToChangeScale();
-
  protected:
   LayerTreeHostImpl(
       const LayerTreeSettings& settings,
       LayerTreeHostImplClient* client,
       TaskRunnerProvider* task_runner_provider,
       RenderingStatsInstrumentation* rendering_stats_instrumentation,
       SharedBitmapManager* shared_bitmap_manager,
       gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager,
       TaskGraphRunner* task_graph_runner,
       std::unique_ptr<AnimationHost> animation_host,
       int id);
 
   // Virtual for testing.
   virtual bool AnimateLayers(base::TimeTicks monotonic_time);
 
   bool is_likely_to_require_a_draw() const {
     return is_likely_to_require_a_draw_;
   }
 
   // Removes empty or orphan RenderPasses from the frame.
   static void RemoveRenderPasses(FrameData* frame);
 
   LayerTreeHostImplClient* client_;
   TaskRunnerProvider* task_runner_provider_;
 
   BeginFrameTracker current_begin_frame_tracker_;
 
  private:
-  enum { kFixedRasterScaleAttemptedScaleChangeThreshold = 5 };
-  enum { kFixedRasterScaleAttemptedScaleChangeHistoryCount = 10 };
-
   gfx::Vector2dF ScrollNodeWithViewportSpaceDelta(
       ScrollNode* scroll_node,
       const gfx::PointF& viewport_point,
       const gfx::Vector2dF& viewport_delta,
       ScrollTree* scroll_tree);
 
   void CreateAndSetRenderer();
   void CleanUpTileManagerAndUIResources();
   void CreateTileManagerResources();
   void ReleaseTreeResources();
@@ skipping 182 matching lines @@
 
   std::set<SwapPromiseMonitor*> swap_promise_monitor_;
 
   bool requires_high_res_to_draw_;
   bool is_likely_to_require_a_draw_;
 
   std::unique_ptr<Viewport> viewport_;
 
   std::unique_ptr<LayerTreeMutator> mutator_;
 
-  bool has_fixed_raster_scale_blurry_content_;
-  std::bitset<kFixedRasterScaleAttemptedScaleChangeHistoryCount>
-      fixed_raster_scale_attempted_scale_change_history_;
   std::unique_ptr<PendingTreeDurationHistogramTimer>
       pending_tree_duration_timer_;
 
   DISALLOW_COPY_AND_ASSIGN(LayerTreeHostImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_HOST_IMPL_H_