Notify Blink about start of gesture scroll through a queued event.

third_party/WebKit/Source/web/WebInputEventConversion.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 375 matching lines @@
 {
     switch (type) {
     case WebInputEvent::TouchStart:
         return PlatformEvent::TouchStart;
     case WebInputEvent::TouchMove:
         return PlatformEvent::TouchMove;
     case WebInputEvent::TouchEnd:
         return PlatformEvent::TouchEnd;
     case WebInputEvent::TouchCancel:
         return PlatformEvent::TouchCancel;
+    case WebInputEvent::TouchScrollStarted:
+        return PlatformEvent::TouchScrollStarted;
     default:
         NOTREACHED();
     }
     return PlatformEvent::TouchStart;
 }
 
 inline PlatformTouchPoint::TouchState toPlatformTouchPointState(const WebTouchPoint::State state)
 {
     switch (state) {
     case WebTouchPoint::StateReleased:
@@ skipping 377 matching lines @@
         break;
     case GestureSourceTouchscreen:
         sourceDevice = WebGestureDeviceTouchscreen;
         break;
     case GestureSourceUninitialized:
         NOTREACHED();
     }
 }
 
 } // namespace blink