Add POINTER_WHEEL_CHANGED event to mojo.

ash/shared/immersive_fullscreen_controller.cc

 // Copyright 2013 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.
 
 #include "ash/shared/immersive_fullscreen_controller.h"
 
 #include <set>
 
 #include "ash/shared/immersive_context.h"
 #include "ash/shared/immersive_focus_watcher.h"
@@ skipping 216 matching lines @@
     default:
       break;
   }
 }
 
 void ImmersiveFullscreenController::OnPointerEventObserved(
     const ui::PointerEvent& event,
     const gfx::Point& location_in_screen,
     views::Widget* target) {
   if (event.IsMousePointerEvent()) {
-    const ui::MouseEvent mouse_event(event);
-    OnMouseEvent(mouse_event, location_in_screen, target);
+    if (event.type() == ui::ET_POINTER_WHEEL_CHANGED) {
+      const ui::MouseWheelEvent mouse_wheel_event(event);
+      OnMouseEvent(mouse_wheel_event, location_in_screen, target);
+    } else {
+      const ui::MouseEvent mouse_event(event);
+      OnMouseEvent(mouse_event, location_in_screen, target);
+    }
   } else {
     DCHECK(event.IsTouchPointerEvent());
     const ui::TouchEvent touch_event(event);
     OnTouchEvent(touch_event, location_in_screen);
   }
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // views::WidgetObserver overrides:
 
@@ skipping 388 matching lines @@
           location.y() < hit_bounds_in_screen.y() &&
           location.x() >= hit_bounds_in_screen.x() &&
           location.x() < hit_bounds_in_screen.right());
 }
 
 gfx::Rect ImmersiveFullscreenController::GetDisplayBoundsInScreen() const {
   return ImmersiveContext::Get()->GetDisplayBoundsInScreen(widget_);
 }
 
 }  // namespace ash