Move WebMouseWheelEvent into its own header file.

content/common/input/gesture_event_stream_validator.cc

 // Copyright 2014 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.
 
 #include "content/common/input/gesture_event_stream_validator.h"
 
 #include "base/logging.h"
 #include "base/strings/stringprintf.h"
+#include "third_party/WebKit/public/platform/WebGestureEvent.h"
 #include "third_party/WebKit/public/platform/WebInputEvent.h"
 #include "ui/events/blink/web_input_event_traits.h"
 
 using blink::WebInputEvent;
 
 namespace content {
 
 GestureEventStreamValidator::GestureEventStreamValidator()
     : scrolling_(false), pinching_(false), waiting_for_tap_end_(false) {
 }
@@ skipping 85 matching lines @@
   // 'continuity check', requiring that all events between an initial tap-down
   // and whatever terminates the sequence to have the same source device type,
   // and that touchpad gestures are only found on ScrollEvents.
   if (event.sourceDevice == blink::WebGestureDeviceUninitialized)
     error_msg->append("Gesture event source is uninitialized.\n");
 
   return error_msg->empty();
 }
 
 }  // namespace content