Scaling scroll/fling events in multi-monitor setup

ash/shell.h

Index: ash/shell.h
diff --git a/ash/shell.h b/ash/shell.h
index 0e2919d28b90de0fe899a347270651be0d52d8c1..bc86059a0e120670429be4e43ce22be551425c63 100644
--- a/ash/shell.h
+++ b/ash/shell.h
@@ -102,6 +102,7 @@ class DisplayManager;
 class DragDropController;
 class EventClientImpl;
 class EventRewriterEventFilter;
+class EventTransformationHandler;
 class FocusCycler;
 class MouseCursorEventFilter;
 class OutputConfiguratorAnimation;
@@ -317,6 +318,9 @@ class ASH_EXPORT Shell
   internal::MouseCursorEventFilter* mouse_cursor_filter() {
     return mouse_cursor_filter_.get();
   }
+  internal::EventTransformationHandler* event_transformation_handler() {
+    return event_transformation_handler_.get();
+  }
   CursorManager* cursor_manager() { return &cursor_manager_; }
 
   ShellDelegate* delegate() { return delegate_.get(); }
@@ -535,6 +539,8 @@ class ASH_EXPORT Shell
   scoped_ptr<internal::ScreenPositionController> screen_position_controller_;
   scoped_ptr<internal::SystemModalContainerEventFilter> modality_filter_;
   scoped_ptr<internal::EventClientImpl> event_client_;
+  scoped_ptr<internal::EventTransformationHandler>
+      event_transformation_handler_;
   scoped_ptr<RootWindowHostFactory> root_window_host_factory_;
 
   // An event filter that rewrites or drops an event.