Add key based scrolling on magnified screen for kiosk mode.

ui/events/event.h

 // Copyright (c) 2012 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 UI_EVENTS_EVENT_H_
 #define UI_EVENTS_EVENT_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/event_types.h"
@@ skipping 32 matching lines @@
 
    private:
     DispatcherApi();
     Event* event_;
 
     DISALLOW_COPY_AND_ASSIGN(DispatcherApi);
   };
 
   const base::NativeEvent& native_event() const { return native_event_; }
   EventType type() const { return type_; }
+  void set_type(EventType type) { type_ = type; }
   const std::string& name() const { return name_; }
   // time_stamp represents time since machine was booted.
   const base::TimeDelta& time_stamp() const { return time_stamp_; }
   int flags() const { return flags_; }
 
   // This is only intended to be used externally by classes that are modifying
   // events in EventFilter::PreHandleKeyEvent().
   void set_flags(int flags) { flags_ = flags; }
 
   EventTarget* target() const { return target_; }
@@ skipping 629 matching lines @@
   // The set of indices of ones in the binary representation of
   // touch_ids_bitfield_ is the set of touch_ids associate with this gesture.
   // This value is stored as a bitfield because the number of touch ids varies,
   // but we currently don't need more than 32 touches at a time.
   const unsigned int touch_ids_bitfield_;
 };
 
 }  // namespace ui
 
 #endif  // UI_EVENTS_EVENT_H_