Take MT jank into account when animating the scroll offset on CC

ui/events/blink/input_handler_proxy.h

Index: ui/events/blink/input_handler_proxy.h
diff --git a/ui/events/blink/input_handler_proxy.h b/ui/events/blink/input_handler_proxy.h
index 3e10d9a1ee82724ab22737e587bf086641e1f1e3..40ca0455dd00072caefb7ee28b1067cefa712177 100644
--- a/ui/events/blink/input_handler_proxy.h
+++ b/ui/events/blink/input_handler_proxy.h
@@ -57,7 +57,8 @@ class InputHandlerProxy
   EventDisposition HandleInputEventWithLatencyInfo(
       const blink::WebInputEvent& event,
       ui::LatencyInfo* latency_info);
-  EventDisposition HandleInputEvent(const blink::WebInputEvent& event);
+  EventDisposition HandleInputEvent(const blink::WebInputEvent& event,
+                                    ui::LatencyInfo* latency_info = nullptr);
 
   // cc::InputHandlerClient implementation.
   void WillShutdown() override;
@@ -103,7 +104,8 @@ class InputHandlerProxy
   EventDisposition HandleGestureScrollBegin(
       const blink::WebGestureEvent& event);
   EventDisposition HandleGestureScrollUpdate(
-      const blink::WebGestureEvent& event);
+      const blink::WebGestureEvent& event,
+      ui::LatencyInfo* latency_info);
   EventDisposition HandleGestureScrollEnd(
       const blink::WebGestureEvent& event);
   EventDisposition HandleGestureFlingStart(