Handle touchpad flings with passive event listeners on compositor thread.

content/renderer/input/input_handler_wrapper.cc

Index: content/renderer/input/input_handler_wrapper.cc
diff --git a/content/renderer/input/input_handler_wrapper.cc b/content/renderer/input/input_handler_wrapper.cc
index 0b0de6cf96e5182fe7820f97caac1fe91f70572e..bc4494521040e248f2571d20ea469d87c11f4d49 100644
--- a/content/renderer/input/input_handler_wrapper.cc
+++ b/content/renderer/input/input_handler_wrapper.cc
@@ -40,6 +40,13 @@ void InputHandlerWrapper::TransferActiveWheelFlingAnimation(
                             render_view_impl_, params));
 }
 
+void InputHandlerWrapper::DispatchNonBlockingEventToMainThread(
+    ui::ScopedWebInputEvent event,
+    const ui::LatencyInfo& latency_info) {
+  input_handler_manager_->DispatchNonBlockingEventToMainThread(
+      routing_id_, std::move(event), latency_info);
+}
+
 void InputHandlerWrapper::WillShutdown() {
   input_handler_manager_->RemoveInputHandler(routing_id_);
 }