Break apart WebGestureEvent from WebInputEvent.

ui/events/blink/blink_event_util.cc

 // Copyright 2015 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.
 
 // MSVC++ requires this to be set before any other includes to get M_PI.
 #define _USE_MATH_DEFINES
 
 #include "ui/events/blink/blink_event_util.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <cmath>
 
 #include "base/time/time.h"
 #include "build/build_config.h"
+#include "third_party/WebKit/public/platform/WebGestureEvent.h"
 #include "third_party/WebKit/public/platform/WebInputEvent.h"
 #include "ui/events/base_event_utils.h"
 #include "ui/events/event_constants.h"
 #include "ui/events/gesture_detection/gesture_event_data.h"
 #include "ui/events/gesture_detection/motion_event.h"
 #include "ui/events/gesture_event_details.h"
 #include "ui/events/keycodes/dom/keycode_converter.h"
 #include "ui/gfx/geometry/safe_integer_conversions.h"
 #include "ui/gfx/geometry/vector2d.h"
 
@@ skipping 582 matching lines @@
       return blink::WebInputEvent::IsRight;
     case DomKeyLocation::NUMPAD:
       return blink::WebInputEvent::IsKeyPad;
     case DomKeyLocation::STANDARD:
       break;
   }
   return static_cast<blink::WebInputEvent::Modifiers>(0);
 }
 
 }  // namespace ui