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

third_party/WebKit/public/web/WebInputEvent.h

 /*
  * 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 121 matching lines @@
         GesturePinchEnd,
         GesturePinchUpdate,
         GestureTypeLast = GesturePinchUpdate,
 
         // WebTouchEvent
         TouchStart,
         TouchTypeFirst = TouchStart,
         TouchMove,
         TouchEnd,
         TouchCancel,
-        TouchTypeLast = TouchCancel,
+        TouchScrollStarted,
+        TouchTypeLast = TouchScrollStarted,
 
         TypeLast = TouchTypeLast
     };
 
     // The modifier constants cannot change their values since pepper
     // does a 1-1 mapping of its values; see
     // content/renderer/pepper/event_conversion.cc
     //
     // A Java counterpart will be generated for this enum.
     // GENERATED_JAVA_ENUM_PACKAGE: org.chromium.blink_public.web
@@ skipping 469 matching lines @@
         , uniqueTouchEventId(0)
     {
     }
 };
 
 #pragma pack(pop)
 
 } // namespace blink
 
 #endif