Follow on for gesture events generated by wheel events.

content/browser/renderer_host/overscroll_controller.h

Index: content/browser/renderer_host/overscroll_controller.h
diff --git a/content/browser/renderer_host/overscroll_controller.h b/content/browser/renderer_host/overscroll_controller.h
index 92fa093bf13ca43776b97eb0c177686c99a70d08..213815f08eb6febc677df0e3094fe625512f80aa 100644
--- a/content/browser/renderer_host/overscroll_controller.h
+++ b/content/browser/renderer_host/overscroll_controller.h
@@ -92,9 +92,7 @@ class OverscrollController {
   // and the over scroll amount (i.e. |overscroll_mode_|, |overscroll_delta_x_|
   // and |overscroll_delta_y_|). Returns true if overscroll was handled by the
   // delegate.
-  bool ProcessOverscroll(float delta_x,
-                         float delta_y,
-                         blink::WebInputEvent::Type event_type);
+  bool ProcessOverscroll(float delta_x, float delta_y, bool is_touchpad);

[tdresser, 2016/02/18 14:35:21]

I slightly prefer sending the type here, as it makes the meaning of the
parameter more clear from the call site.

What's the advantage of this approach?

[dtapuska, 2016/02/18 14:41:17]

ProcessOverscroll is called both from MouseWheel and GestureScroll..

I could keep it; but I'd need to move the check if event_type == MouseWheel ||
event_type == GestureScroll && !IsGestureEventFromTouchscreen() inside.

This felt cleaner; but I can change.

 
   // Completes the desired action from the current gesture.
   void CompleteAction();
@@ -121,6 +119,7 @@ class OverscrollController {
   // The delegate that receives the overscroll updates. The delegate is not
   // owned by this controller.
   OverscrollControllerDelegate* delegate_;
+  bool use_gesutre_wheel_scrolling_;
 
   DISALLOW_COPY_AND_ASSIGN(OverscrollController);
 };