Adding handlers for user gesture callbacks.

Source/platform/UserGestureIndicator.h

 /*
  * Copyright (C) 2010 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 24 matching lines @@
 
 class UserGestureIndicator;
 
 enum ProcessingUserGestureState {
     DefinitelyProcessingNewUserGesture,
     DefinitelyProcessingUserGesture,
     PossiblyProcessingUserGesture,
     DefinitelyNotProcessingUserGesture
 };
 
+class UserGestureHandler {
+public:
+    virtual ~UserGestureHandler() { }
+    virtual void onGesture() = 0;
+};
+
 class PLATFORM_EXPORT UserGestureToken : public RefCounted<UserGestureToken> {
 public:
     virtual ~UserGestureToken() { }
     virtual bool hasGestures() const = 0;
     virtual void setOutOfProcess() = 0;
     virtual void setJavascriptPrompt() = 0;
 };
 
 class PLATFORM_EXPORT UserGestureIndicatorDisabler {
     WTF_MAKE_NONCOPYABLE(UserGestureIndicatorDisabler);
 public:
     UserGestureIndicatorDisabler();
     ~UserGestureIndicatorDisabler();
 
 private:
     ProcessingUserGestureState m_savedState;
     UserGestureIndicator* m_savedIndicator;
 };
 
 class PLATFORM_EXPORT UserGestureIndicator {
     WTF_MAKE_NONCOPYABLE(UserGestureIndicator);
     friend class UserGestureIndicatorDisabler;
 public:
     static bool processingUserGesture();
     static bool consumeUserGesture();
     static UserGestureToken* currentToken();
+    static void setHandler(UserGestureHandler*);
 
     explicit UserGestureIndicator(ProcessingUserGestureState);
     explicit UserGestureIndicator(PassRefPtr<UserGestureToken>);
     ~UserGestureIndicator();
 
 
 private:
     static ProcessingUserGestureState s_state;
     static UserGestureIndicator* s_topmostIndicator;
+    static UserGestureHandler* s_handler;
     ProcessingUserGestureState m_previousState;
     RefPtr<UserGestureToken> m_token;
 };
 
 }
 
 #endif