MouseWheelEventQueue should respect ScrollBegin/End state from RenderWidgetHost.

content/browser/renderer_host/input/input_router_impl.h

Index: content/browser/renderer_host/input/input_router_impl.h
diff --git a/content/browser/renderer_host/input/input_router_impl.h b/content/browser/renderer_host/input/input_router_impl.h
index 239d0d212c7b724a01f1bb9b6d0eb51401f7c6af..4597f49d9c31902959b858549396bf9a40c8b680 100644
--- a/content/browser/renderer_host/input/input_router_impl.h
+++ b/content/browser/renderer_host/input/input_router_impl.h
@@ -116,6 +116,7 @@ class CONTENT_EXPORT InputRouterImpl
   void ForwardGestureEventWithLatencyInfo(
       const blink::WebGestureEvent& gesture_event,
       const ui::LatencyInfo& latency_info) override;
+  bool is_in_gesture_scroll() override;

[dtapuska, 2017/04/12 19:24:46]

non-inlined can't be lowercased.

what about gesture scrolls for non-touchpad? This needs some clarity as to what
it is doing.

[wjmaclean, 2017/04/12 19:47:35]

Can you expand on what you mean by clarity? Since this is part of
MouseWheelEventQueue's client interface, I would have thought the intent here is
obvious.

 
   bool SendMoveCaret(std::unique_ptr<IPC::Message> message);
   bool SendSelectMessage(std::unique_ptr<IPC::Message> message);