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

cc/layers/layer.h

Index: cc/layers/layer.h
diff --git a/cc/layers/layer.h b/cc/layers/layer.h
index e1e13f68cdb25da008bb2021015d18c8b9d30ccc..bb2b6d5ae0cbf26ec4598edda13fd3cea21c2032 100644
--- a/cc/layers/layer.h
+++ b/cc/layers/layer.h
@@ -383,6 +383,7 @@ class CC_EXPORT Layer : public base::RefCounted<Layer>,
   virtual void CalculateContentsScale(float ideal_contents_scale,
                                       float device_scale_factor,
                                       float page_scale_factor,
+                                      float maximum_animation_contents_scale,
                                       bool animating_transform_to_screen,
                                       float* contents_scale_x,
                                       float* contents_scale_y,