cc: Keep PaintImage in DrawImage.

cc/paint/discardable_image_map.cc

Index: cc/paint/discardable_image_map.cc
diff --git a/cc/paint/discardable_image_map.cc b/cc/paint/discardable_image_map.cc
index 2a2f0fc1734a937199ae284e82e27bd05be37cdc..4b6c5824089f1a90d637e52ce88df2f7d09b87f5 100644
--- a/cc/paint/discardable_image_map.cc
+++ b/cc/paint/discardable_image_map.cc
@@ -44,7 +44,7 @@ void DiscardableImageMap::GetDiscardableImagesInRect(
   }
 }
 
-gfx::Rect DiscardableImageMap::GetRectForImage(ImageId image_id) const {
+gfx::Rect DiscardableImageMap::GetRectForImage(PaintImage::Id image_id) const {
   const auto& it = image_id_to_rect_.find(image_id);
   return it == image_id_to_rect_.end() ? gfx::Rect() : it->second;
 }