use enum to specify deviceSource for fling animation.

content/common/input/input_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/input_event_stream_validator.h"
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "content/public/common/content_switches.h"
 #include "third_party/WebKit/public/web/WebInputEvent.h"
 
 namespace content {
 
 using blink::WebInputEvent;
 using blink::WebGestureEvent;
 
 InputEventStreamValidator::InputEventStreamValidator() {
   CommandLine* command_line = CommandLine::ForCurrentProcess();
   enabled_ = command_line->HasSwitch(switches::kValidateInputEventStream);
 }
 InputEventStreamValidator::~InputEventStreamValidator() {}
 
 void InputEventStreamValidator::OnEvent(const WebInputEvent& event) {
   if (!enabled_)
     return;
   const char* error_message = NULL;
   if (WebInputEvent::isGestureEventType(event.type)) {
     const WebGestureEvent& gesture_event =
         static_cast<const WebGestureEvent&>(event);
-    if (gesture_event.sourceDevice == blink::WebGestureEvent::Touchscreen) {
+    if (gesture_event.sourceDevice == blink::WebGestureDeviceTouchpad) {
       if (!gesture_validator_.Validate(gesture_event, &error_message))
         NOTREACHED() << error_message;
     }
   }
 }
 
 }  // namespace content