SetNeedsRedraw directly when updating a visible tile.

cc/test/layer_tree_test.cc

Index: cc/test/layer_tree_test.cc
diff --git a/cc/test/layer_tree_test.cc b/cc/test/layer_tree_test.cc
index 8c0255af03112cfa65e55d67314e049f880ca2a3..0c07dd875c6bc86e8f66114f98d4021de82b7175 100644
--- a/cc/test/layer_tree_test.cc
+++ b/cc/test/layer_tree_test.cc
@@ -191,11 +191,6 @@ class LayerTreeHostImplForTesting : public LayerTreeHostImpl {
     LayerTreeHostImpl::ReclaimResources(ack);
   }
 
-  void UpdateVisibleTiles() override {
-    LayerTreeHostImpl::UpdateVisibleTiles();
-    test_hooks_->UpdateVisibleTilesOnThread(this);
-  }
-
   void NotifyReadyToActivate() override {
     if (block_notify_ready_to_activate_for_testing_)
       notify_ready_to_activate_was_blocked_ = true;
@@ -256,6 +251,11 @@ class LayerTreeHostImplForTesting : public LayerTreeHostImpl {
     return test_hooks_->LowFrequencyAnimationInterval();
   }
 
+  void NotifyTileStateChanged(const Tile* tile) override {
+    LayerTreeHostImpl::NotifyTileStateChanged(tile);
+    test_hooks_->NotifyTileStateChangedOnThread(this, tile);
+  }
+
  private:
   TestHooks* test_hooks_;
   bool block_notify_ready_to_activate_for_testing_;