Teach main thread event queue about closures.

content/renderer/input/input_handler_manager.cc

Index: content/renderer/input/input_handler_manager.cc
diff --git a/content/renderer/input/input_handler_manager.cc b/content/renderer/input/input_handler_manager.cc
index f1f02b68179eeae85da7cd43ccb5743ec4a196a0..bcf5cd5de2bdc4e17cbc468c91010aaf9822ef4d 100644
--- a/content/renderer/input/input_handler_manager.cc
+++ b/content/renderer/input/input_handler_manager.cc
@@ -230,6 +230,12 @@ void InputHandlerManager::HandleInputEvent(
                  weak_ptr_factory_.GetWeakPtr(), callback));
 }
 
+void InputHandlerManager::QueueClosureForMainThreadEventQueue(
+    int routing_id,
+    const base::Closure& closure) {
+  client_->QueueClosureForMainThreadEventQueue(routing_id, closure);
+}
+
 void InputHandlerManager::DidHandleInputEventAndOverscroll(
     const InputEventAckStateCallback& callback,
     InputHandlerProxy::EventDisposition event_disposition,