MouseWheelEventQueue should respect ScrollBegin/End state from RenderWidgetHost.

content/browser/renderer_host/input/input_router_impl.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_INPUT_INPUT_ROUTER_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_INPUT_INPUT_ROUTER_IMPL_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 98 matching lines @@
                          InputEventAckState ack_result) override;
 
   // MouseWheelEventQueueClient
   void SendMouseWheelEventImmediately(
       const MouseWheelEventWithLatencyInfo& touch_event) override;
   void OnMouseWheelEventAck(const MouseWheelEventWithLatencyInfo& event,
                             InputEventAckState ack_result) override;
   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);
   bool Send(IPC::Message* message);
 
   // Filters and forwards |input_event| to the appropriate handler.
   void FilterAndSendWebInputEvent(const blink::WebInputEvent& input_event,
                                   const ui::LatencyInfo& latency_info);
 
   // Utility routine for filtering and forwarding |input_event| to the
@@ skipping 137 matching lines @@
 
   // Last touch position relative to screen. Used to compute movementX/Y.
   std::map<int, gfx::Point> global_touch_position_;
 
   DISALLOW_COPY_AND_ASSIGN(InputRouterImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_INPUT_INPUT_ROUTER_IMPL_H_