cc: Plumb more details about pixel refs to tile manager.

cc/tiles/tile_manager.cc

Index: cc/tiles/tile_manager.cc
diff --git a/cc/tiles/tile_manager.cc b/cc/tiles/tile_manager.cc
index 3ff2885006d3f1cdb04e8ddc4f5128d40e0c060e..f90faa08d35c62b4bfa58f75b667e105d0a8c74a 100644
--- a/cc/tiles/tile_manager.cc
+++ b/cc/tiles/tile_manager.cc
@@ -689,10 +689,10 @@ scoped_refptr<RasterTask> TileManager::CreateRasterTask(
 
   // Create and queue all image decode tasks that this tile depends on.
   ImageDecodeTask::Vector decode_tasks;
-  std::vector<SkPixelRef*> pixel_refs;
+  std::vector<skia::PositionPixelRef> pixel_refs;
   prioritized_tile.raster_source()->GatherPixelRefs(
       tile->content_rect(), tile->contents_scale(), &pixel_refs);
-  for (SkPixelRef* pixel_ref : pixel_refs) {
+  for (const skia::PositionPixelRef& pixel_ref : pixel_refs) {
     decode_tasks.push_back(image_decode_controller_.GetTaskForPixelRef(
         pixel_ref, tile->layer_id(), prepare_tiles_count_));
   }