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 d1d196267ffc8c702da95a3fb6ec34401246d297..913a3a0075910b730bb56a1f3234d57a404fb732 100644
--- a/cc/test/layer_tree_test.cc
+++ b/cc/test/layer_tree_test.cc
@@ -208,11 +208,6 @@ 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;
@@ -273,6 +268,11 @@ 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_;
@@ -453,7 +453,7 @@ void LayerTreeTest::EndTest() {
   }
 }
 
-void LayerTreeTest::EndTestAfterDelay(int delay_milliseconds) {
+void LayerTreeTest::EndTestAfterDelayMs(int delay_milliseconds) {
   main_task_runner_->PostDelayedTask(
       FROM_HERE,
       base::Bind(&LayerTreeTest::EndTest, main_thread_weak_ptr_),