use enum to specify deviceSource for fling animation.

content/browser/renderer_host/input/touch_emulator.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/browser/renderer_host/input/touch_emulator.h"
 
 #include "content/browser/renderer_host/input/motion_event_web.h"
 #include "content/browser/renderer_host/input/web_input_event_util.h"
 #include "content/common/input/web_touch_event_traits.h"
 #include "content/public/common/content_client.h"
@@ skipping 301 matching lines @@
   DCHECK(pinch_gesture_active_);
   pinch_gesture_active_ = false;
   FillPinchEvent(event);
   pinch_event_.type = WebInputEvent::GesturePinchEnd;
   client_->ForwardGestureEvent(pinch_event_);
 }
 
 void TouchEmulator::FillPinchEvent(const WebInputEvent& event) {
   pinch_event_.timeStampSeconds = event.timeStampSeconds;
   pinch_event_.modifiers = event.modifiers;
-  pinch_event_.sourceDevice = blink::WebGestureEvent::Touchscreen;
+  pinch_event_.sourceDevice = blink::WebGestureDeviceTouchpad;
   pinch_event_.x = pinch_anchor_.x();
   pinch_event_.y = pinch_anchor_.y();
 }
 
 void TouchEmulator::ScrollEnd(const WebGestureEvent& event) {
   WebGestureEvent scroll_event;
   scroll_event.timeStampSeconds = event.timeStampSeconds;
   scroll_event.modifiers = event.modifiers;
-  scroll_event.sourceDevice = blink::WebGestureEvent::Touchscreen;
+  scroll_event.sourceDevice = blink::WebGestureDeviceTouchpad;
   scroll_event.type = WebInputEvent::GestureScrollEnd;
   client_->ForwardGestureEvent(scroll_event);
 }
 
 bool TouchEmulator::FillTouchEventAndPoint(const WebMouseEvent& mouse_event) {
   if (mouse_event.type != WebInputEvent::MouseDown &&
       mouse_event.type != WebInputEvent::MouseMove &&
       mouse_event.type != WebInputEvent::MouseUp) {
     return false;
   }
@@ skipping 31 matching lines @@
   point.screenPosition.y = mouse_event.globalY;
 
   return true;
 }
 
 bool TouchEmulator::InPinchGestureMode() const {
   return shift_pressed_ && allow_pinch_;
 }
 
 }  // namespace content