Rasterize at maximum scale for scale animations on CPU-rasterized layers

cc/layers/picture_layer_impl.h

Index: cc/layers/picture_layer_impl.h
diff --git a/cc/layers/picture_layer_impl.h b/cc/layers/picture_layer_impl.h
index d93dbcd04f5e332defa5a1037a5d655111c6efb6..29c502441eebdeb68a6df8503086fb2bc5454731 100644
--- a/cc/layers/picture_layer_impl.h
+++ b/cc/layers/picture_layer_impl.h
@@ -74,6 +74,7 @@ class CC_EXPORT PictureLayerImpl
   virtual void CalculateContentsScale(float ideal_contents_scale,
                                       float device_scale_factor,
                                       float page_scale_factor,
+                                      float maximum_animation_scale_factor,
                                       bool animating_transform_to_screen,
                                       float* contents_scale_x,
                                       float* contents_scale_y,
@@ -122,14 +123,15 @@ class CC_EXPORT PictureLayerImpl
   void RemoveTiling(float contents_scale);
   void RemoveAllTilings();
   void SyncFromActiveLayer(const PictureLayerImpl* other);
-  void ManageTilings(bool animating_transform_to_screen);
+  void ManageTilings(bool animating_transform_to_screen,
+                     float maximum_animation_scale_factor);
   bool ShouldHaveLowResTiling() const {
     return should_use_low_res_tiling_ && !ShouldUseGpuRasterization();
   }
   virtual bool ShouldAdjustRasterScale(
       bool animating_transform_to_screen) const;
-  virtual void RecalculateRasterScales(
-      bool animating_transform_to_screen);
+  virtual void RecalculateRasterScales(bool animating_transform_to_screen,
+                                       float maximum_animation_scale_factor);
   void CleanUpTilingsOnActiveLayer(
       std::vector<PictureLayerTiling*> used_tilings);
   float MinimumContentsScale() const;