Add key based scrolling on magnified screen for kiosk mode.

ash/accelerators/accelerator_table.h

Index: ash/accelerators/accelerator_table.h
diff --git a/ash/accelerators/accelerator_table.h b/ash/accelerators/accelerator_table.h
index d12096037b0dc228643fda2da875a468624bd83b..2cf3357ac23d3ba096e272a0da967ca111cdc322 100644
--- a/ash/accelerators/accelerator_table.h
+++ b/ash/accelerators/accelerator_table.h
@@ -132,6 +132,11 @@ enum AcceleratorAction {
   TOGGLE_MIRROR_MODE,
   DISABLE_GPU_WATCHDOG,
   LOCK_SCREEN,
+  MAGNIFY_SCREEN_UP,
+  MAGNIFY_SCREEN_DOWN,
+  MAGNIFY_SCREEN_LEFT,
+  MAGNIFY_SCREEN_RIGHT,
+  MAGNIFY_SCREEN_STOP_SCROLL,
   OPEN_CROSH,
   OPEN_FILE_MANAGER,
   SWITCH_TO_NEXT_USER,
@@ -197,6 +202,12 @@ ASH_EXPORT extern const size_t kActionsAllowedInAppModeLength;
 ASH_EXPORT extern const AcceleratorAction kActionsNeedingWindow[];
 ASH_EXPORT extern const size_t kActionsNeedingWindowLength;
 
+#if defined(OS_CHROMEOS)
+// Accelerators that are enabled only when magnifier is enabled.
+ASH_EXPORT extern const AcceleratorData kMagnifierAcceleratorData[];
+ASH_EXPORT extern const size_t kMagnifierAcceleratorDataLength;
+#endif
+
 }  // namespace ash
 
 #endif  // ASH_ACCELERATORS_ACCELERATOR_TABLE_H_