Limit image filtering during scale animations

cc/playback/display_list_raster_source.h

 // Copyright 2014 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_PLAYBACK_DISPLAY_LIST_RASTER_SOURCE_H_
 #define CC_PLAYBACK_DISPLAY_LIST_RASTER_SOURCE_H_
 
 #include <stddef.h>
 
 #include <vector>
@@ skipping 100 matching lines @@
   scoped_refptr<DisplayListRasterSource> CreateCloneWithoutLCDText() const;
 
   // Image decode controller should be set once. Its lifetime has to exceed that
   // of the raster source, since the raster source will access it during raster.
   void SetImageDecodeController(ImageDecodeController* image_decode_controller);
 
   // base::trace_event::MemoryDumpProvider implementation
   bool OnMemoryDump(const base::trace_event::MemoryDumpArgs& args,
                     base::trace_event::ProcessMemoryDump* pmd) override;
 
+  enum class ImageScalingOptimization {
+    Animation,  // Optimize for smooth/continuous transitions.
+    Static,     // Optimize for high-quality static content.
+  };
+  void SetImageScalingOptimization(ImageScalingOptimization);
+
  protected:
   friend class base::RefCountedThreadSafe<DisplayListRasterSource>;
 
   DisplayListRasterSource(const DisplayListRecordingSource* other,
                           bool can_use_lcd_text);
   DisplayListRasterSource(const DisplayListRasterSource* other,
                           bool can_use_lcd_text);
   ~DisplayListRasterSource() override;
 
   // These members are const as this raster source may be in use on another
@@ skipping 31 matching lines @@
                     float contents_scale) const;
 
   void PrepareForPlaybackToCanvas(SkCanvas* canvas,
                                   const gfx::Rect& canvas_bitmap_rect,
                                   const gfx::Rect& canvas_playback_rect,
                                   float contents_scale) const;
 
   // Used to ensure that memory dump logic always happens on the same thread.
   base::ThreadChecker memory_dump_thread_checker_;
 
+  ImageScalingOptimization image_scaling_optimization_;
+
   DISALLOW_COPY_AND_ASSIGN(DisplayListRasterSource);
 };
 
 }  // namespace cc
 
 #endif  // CC_PLAYBACK_DISPLAY_LIST_RASTER_SOURCE_H_