[cc] Add nearest neighbor filtering for PictureLayer.

cc/layers/picture_layer_impl.h

 // 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.
 
 #ifndef CC_LAYERS_PICTURE_LAYER_IMPL_H_
 #define CC_LAYERS_PICTURE_LAYER_IMPL_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 70 matching lines @@
   WhichTree GetTree() const override;
   bool RequiresHighResToDraw() const override;
 
   // PushPropertiesTo active tree => pending tree.
   void SyncTiling(const PictureLayerTiling* tiling);
 
   // Mask-related functions.
   void GetContentsResourceId(ResourceProvider::ResourceId* resource_id,
                              gfx::Size* resource_size) const override;
 
+  void SetNearestNeighbor(bool nearest_neighbor);
+
   size_t GPUMemoryUsageInBytes() const override;
 
   void RunMicroBenchmark(MicroBenchmarkImpl* benchmark) override;
 
   bool CanHaveTilings() const;
 
   // Functions used by tile manager.
   PictureLayerImpl* GetPendingOrActiveTwinLayer() const;
   bool IsOnActiveOrPendingTree() const;
   // Virtual for testing.
@@ skipping 67 matching lines @@
 
   bool raster_source_scale_is_fixed_;
   bool was_screen_space_transform_animating_;
   bool needs_post_commit_initialization_;
   // A sanity state check to make sure UpdateTilePriorities only gets called
   // after a CalculateContentsScale/ManageTilings.
   bool should_update_tile_priorities_;
   bool only_used_low_res_last_append_quads_;
   const bool is_mask_;
 
+  bool nearest_neighbor_;
+
   // Any draw properties derived from |transform|, |viewport|, and |clip|
   // parameters in LayerTreeHostImpl::SetExternalDrawConstraints are not valid
   // for prioritizing tiles during resourceless software draws. This is because
   // resourceless software draws can have wildly different transforms/viewports
   // from regular draws. Save a copy of the required draw properties of the last
   // frame that has a valid viewport for prioritizing tiles.
   gfx::Rect visible_rect_for_tile_priority_;
 
   friend class PictureLayer;
   DISALLOW_COPY_AND_ASSIGN(PictureLayerImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_PICTURE_LAYER_IMPL_H_