Fix dcheck failing on ChromeOS

third_party/WebKit/public/platform/WebGestureEvent.h

 // Copyright 2016 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 WebGestureEvent_h
 #define WebGestureEvent_h
 
 #include "WebFloatSize.h"
 #include "WebGestureDevice.h"
 #include "WebInputEvent.h"
@@ skipping 186 matching lines @@
     DCHECK(m_type == WebInputEvent::GestureScrollUpdate);
     return true;
   }
 
   bool isScrollEvent() const {
     switch (m_type) {
       case GestureScrollBegin:
       case GestureScrollEnd:
       case GestureScrollUpdate:
       case GestureFlingStart:
+      case GestureFlingCancel:
       case GesturePinchBegin:
       case GesturePinchEnd:
       case GesturePinchUpdate:
         return true;
       case GestureTap:
       case GestureTapUnconfirmed:
       case GestureTapDown:
       case GestureShowPress:
       case GestureTapCancel:
       case GestureTwoFingerTap:
       case GestureLongPress:
       case GestureLongTap:
         return false;
       default:
         NOTREACHED();
         return false;
     }
   }
 
 #endif
 };
 
 #pragma pack(pop)
 
 }  // namespace blink
 
 #endif  // WebGestureEvent_h