cc: Implement deadine scheduling disabled by default

cc/trees/layer_tree_host_impl.h

Index: cc/trees/layer_tree_host_impl.h
diff --git a/cc/trees/layer_tree_host_impl.h b/cc/trees/layer_tree_host_impl.h
index 4efbffa144c3f3c7f4cb2c2a2fff8891f7c2eef1..4d6b86e83be9b0b4ed81df0ff8980d68bbb35b60 100644
--- a/cc/trees/layer_tree_host_impl.h
+++ b/cc/trees/layer_tree_host_impl.h
@@ -183,6 +183,9 @@ class CC_EXPORT LayerTreeHostImpl
   // immediately if any notifications had been blocked while blocking.
   virtual void BlockNotifyReadyToActivateForTesting(bool block);
 
+  // This allows us to inject DidInitializeVisibleTile events for testing.
+  void DidInitializeVisibleTileForTesting();
+
   bool device_viewport_valid_for_tile_management() const {
     return device_viewport_valid_for_tile_management_;
   }
@@ -405,8 +408,6 @@ class CC_EXPORT LayerTreeHostImpl
 
   ResourceProvider::ResourceId ResourceIdForUIResource(UIResourceId uid) const;
 
-  void DidInitializeVisibleTileForTesting() { DidInitializeVisibleTile(); }
-
  protected:
   LayerTreeHostImpl(
       const LayerTreeSettings& settings,