use enum to specify deviceSource for fling animation.

content/child/blink_platform_impl.h

 // 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.
 
 #ifndef CONTENT_CHILD_BLINK_PLATFORM_IMPL_H_
 #define CONTENT_CHILD_BLINK_PLATFORM_IMPL_H_
 
 #include "base/compiler_specific.h"
 #include "base/debug/trace_event.h"
 #include "base/platform_file.h"
 #include "base/threading/thread_local_storage.h"
 #include "base/timer/timer.h"
 #include "content/child/webcrypto/webcrypto_impl.h"
 #include "content/child/webfallbackthemeengine_impl.h"
 #include "content/common/content_export.h"
 #include "third_party/WebKit/public/platform/Platform.h"
+#include "third_party/WebKit/public/platform/WebGestureDevice.h"
 #include "third_party/WebKit/public/platform/WebURLError.h"
 #include "ui/base/layout.h"
 
 #if defined(USE_DEFAULT_RENDER_THEME)
 #include "content/child/webthemeengine_impl_default.h"
 #elif defined(OS_WIN)
 #include "content/child/webthemeengine_impl_win.h"
 #elif defined(OS_MACOSX)
 #include "content/child/webthemeengine_impl_mac.h"
 #elif defined(OS_ANDROID)
@@ skipping 107 matching lines @@
   virtual void suddenTerminationChanged(bool enabled) { }
   virtual double currentTime();
   virtual double monotonicallyIncreasingTime();
   virtual void cryptographicallyRandomValues(
       unsigned char* buffer, size_t length);
   virtual void setSharedTimerFiredFunction(void (*func)());
   virtual void setSharedTimerFireInterval(double interval_seconds);
   virtual void stopSharedTimer();
   virtual void callOnMainThread(void (*func)(void*), void* context);
   virtual blink::WebGestureCurve* createFlingAnimationCurve(
-      int device_source,
+      blink::WebGestureDevice device_source,
       const blink::WebFloatPoint& velocity,
       const blink::WebSize& cumulative_scroll) OVERRIDE;
   virtual void didStartWorkerRunLoop(
       const blink::WebWorkerRunLoop& runLoop) OVERRIDE;
   virtual void didStopWorkerRunLoop(
       const blink::WebWorkerRunLoop& runLoop) OVERRIDE;
   virtual blink::WebCrypto* crypto() OVERRIDE;
 
   void SetFlingCurveParameters(const std::vector<float>& new_touchpad,
                                const std::vector<float>& new_touchscreen);
@@ skipping 19 matching lines @@
   bool shared_timer_fire_time_was_set_while_suspended_;
   int shared_timer_suspended_;  // counter
   scoped_ptr<FlingCurveConfiguration> fling_curve_configuration_;
   base::ThreadLocalStorage::Slot current_thread_slot_;
   WebCryptoImpl web_crypto_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_BLINK_PLATFORM_IMPL_H_