Introduce EventProcessor::OnEventProcessingStarted()

ui/views/controls/menu/menu_host_root_view.cc

 // 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.
 
 #include "ui/views/controls/menu/menu_host_root_view.h"
 
 #include "ui/views/controls/menu/menu_controller.h"
 #include "ui/views/controls/menu/menu_item_view.h"
 #include "ui/views/controls/menu/submenu_view.h"
 
@@ skipping 37 matching lines @@
   RootView::OnMouseMoved(event);
   if (GetMenuController())
     GetMenuController()->OnMouseMoved(submenu_, event);
 }
 
 bool MenuHostRootView::OnMouseWheel(const ui::MouseWheelEvent& event) {
   return GetMenuController() &&
       GetMenuController()->OnMouseWheel(submenu_, event);
 }
 
-ui::EventDispatchDetails MenuHostRootView::OnEventFromSource(ui::Event* event) {
-  ui::EventDispatchDetails result = RootView::OnEventFromSource(event);
+void MenuHostRootView::OnEventProcessingFinished(ui::Event* event) {
+  RootView::OnEventProcessingFinished(event);
 
-  if (event->IsGestureEvent()) {
-    ui::GestureEvent* gesture_event = event->AsGestureEvent();
-    if (gesture_event->handled())
-      return result;
-    // ChromeOS uses MenuController to forward events like other
-    // mouse events.
-    if (!GetMenuController())
-      return result;
-    GetMenuController()->OnGestureEvent(submenu_, gesture_event);
-  }
-
-  return result;
+  // Forward unhandled gesture events to our menu controller.
+  // TODO(tdanderson): Investigate whether this should be moved into a
+  //                   post-target handler installed on |this| instead
+  //                   (invoked only if event->target() == this).
+  if (event->IsGestureEvent() && !event->handled() && GetMenuController())
+    GetMenuController()->OnGestureEvent(submenu_, event->AsGestureEvent());
 }
 
 MenuController* MenuHostRootView::GetMenuController() {
   return submenu_ ? submenu_->GetMenuItem()->GetMenuController() : NULL;
 }
 
 bool MenuHostRootView::DoesEventTargetEmptyMenuItem(
     const ui::MouseEvent& event) {
   View* view = GetEventHandlerForPoint(event.location());
   return view && view->id() == MenuItemView::kEmptyMenuItemViewID;
 }
 
 }  // namespace views