cc: Low quality support for low res tiles

cc/resources/tile.h

Index: cc/resources/tile.h
diff --git a/cc/resources/tile.h b/cc/resources/tile.h
index 2aa4c651480412fd7a58d2a6274d484c27110d87..dad2c99984f468651804be92e54ac0891f192ade 100644
--- a/cc/resources/tile.h
+++ b/cc/resources/tile.h
@@ -35,6 +35,10 @@ class CC_EXPORT Tile : public base::RefCounted<Tile> {
     return picture_pile_.get();
   }
 
+  const PicturePileImpl* picture_pile() const {
+    return picture_pile_.get();
+  }
+
   const TilePriority& priority(WhichTree tree) const {
     return priority_[tree];
   }
@@ -84,10 +88,10 @@ class CC_EXPORT Tile : public base::RefCounted<Tile> {
 
   // For test only methods.
   bool HasRasterTaskForTesting() const {
-    return !managed_state().raster_task.is_null();
+    return !managed_state().pending_tile_versions.empty();
   }
   void ResetRasterTaskForTesting() {
-    managed_state().raster_task.Reset();
+    managed_state().pending_tile_versions.clear();
   }
 
  private: