Resend unconsumed scroll update from guest back to embedder (WebView Scroll Bubble).

content/browser/frame_host/render_widget_host_view_guest.h

Index: content/browser/frame_host/render_widget_host_view_guest.h
diff --git a/content/browser/frame_host/render_widget_host_view_guest.h b/content/browser/frame_host/render_widget_host_view_guest.h
index a5ead6993ba5ad12083ae38f528f2495291fd5dd..2ff172ee84654078ea2ec2567bae8162ead560b8 100644
--- a/content/browser/frame_host/render_widget_host_view_guest.h
+++ b/content/browser/frame_host/render_widget_host_view_guest.h
@@ -11,6 +11,7 @@
 #include "content/browser/frame_host/render_widget_host_view_child_frame.h"
 #include "content/common/content_export.h"
 #include "content/common/cursors/webcursor.h"
+#include "third_party/WebKit/public/web/WebInputEvent.h"
 #include "ui/events/event.h"
 #include "ui/events/gestures/gesture_recognizer.h"
 #include "ui/events/gestures/gesture_types.h"
@@ -135,6 +136,12 @@ class CONTENT_EXPORT RenderWidgetHostViewGuest
   gfx::NativeViewId GetParentForWindowlessPlugin() const override;
 #endif
 
+  void WheelEventAck(const blink::WebMouseWheelEvent& event,
+                     InputEventAckState ack_result) override;
+
+  void GestureEventAck(const blink::WebGestureEvent& event,
+                       InputEventAckState ack_result) override;
+
   // Overridden from ui::GestureEventHelper.
   bool CanDispatchToConsumer(ui::GestureConsumer* consumer) override;
   void DispatchGestureEvent(ui::GestureEvent* event) override;