Add key based scrolling on magnified screen for kiosk mode.

ash/accelerators/accelerator_controller.h

Index: ash/accelerators/accelerator_controller.h
diff --git a/ash/accelerators/accelerator_controller.h b/ash/accelerators/accelerator_controller.h
index ee4ddfc00c6d06b56a20543774d1d263d9131507..7ea486d80b1ce497f67cc94149892fde3ed7c76d 100644
--- a/ash/accelerators/accelerator_controller.h
+++ b/ash/accelerators/accelerator_controller.h
@@ -8,6 +8,7 @@
 #include <map>
 #include <set>
 
+#include "ash/accelerators/accelerator_table.h"
 #include "ash/accelerators/exit_warning_handler.h"
 #include "ash/ash_export.h"
 #include "base/basictypes.h"
@@ -22,7 +23,6 @@ class AcceleratorManager;
 
 namespace ash {
 
-struct AcceleratorData;
 class BrightnessControlDelegate;
 class ExitWarningHandler;
 class ImeControlDelegate;
@@ -65,6 +65,10 @@ class ASH_EXPORT AcceleratorController : public ui::AcceleratorTarget {
   AcceleratorController();
   virtual ~AcceleratorController();
 
+  // Installs/Uninstalls accelerators for the magnified screen.
+  void InstallMagnifierAccelerators();
+  void UninstallMagnifierAccelerators();
+
   // Registers a global keyboard accelerator for the specified target. If
   // multiple targets are registered for an accelerator, a target registered
   // later has higher priority.
@@ -131,9 +135,14 @@ class ASH_EXPORT AcceleratorController : public ui::AcceleratorTarget {
   // Initializes the accelerators this class handles as a target.
   void Init();
 
-  // Registers the specified accelerators.
+  // Registers/Unregisters the specified accelerators.
   void RegisterAccelerators(const AcceleratorData accelerators[],
                             size_t accelerators_length);
+  void UnregisterAccelerators(const AcceleratorData accelerators[],
+                              size_t accelerators_length);
+
+  void AddReservedAction(AcceleratorAction action);
+  void RemoveReservedAction(AcceleratorAction action);
 
   void SetKeyboardBrightnessControlDelegate(
       scoped_ptr<KeyboardBrightnessControlDelegate>