Support targeting for gestures in ViewTargeter

ui/views/view_targeter.h

 // Copyright 2014 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.
 
 #ifndef UI_VIEWS_VIEW_TARGETER_H_
 #define UI_VIEWS_VIEW_TARGETER_H_
 
 #include "ui/events/event_targeter.h"
 #include "ui/views/views_export.h"
 
 namespace views {
 
+namespace internal {
+class RootView;
+}  // namespace internal
+
 class View;
 class ViewTargeterDelegate;
 
 // A ViewTargeter is installed on a View that wishes to use the custom
 // hit-testing or event-targeting behaviour defined by |delegate|.
 class VIEWS_EXPORT ViewTargeter : public ui::EventTargeter {
  public:
   explicit ViewTargeter(ViewTargeterDelegate* delegate);
   virtual ~ViewTargeter();
 
@@ skipping 10 matching lines @@
   virtual ui::EventTarget* FindNextBestTarget(ui::EventTarget* previous_target,
                                               ui::Event* event) OVERRIDE;
   virtual bool SubtreeCanAcceptEvent(
       ui::EventTarget* target,
       const ui::LocatedEvent& event) const OVERRIDE;
   virtual bool EventLocationInsideBounds(
       ui::EventTarget* target,
       const ui::LocatedEvent& event) const OVERRIDE;
 
  private:
+  // TODO(tdanderson): Un-friend RootView once RootView::DispatchGestureEvent()
+  //                   has been removed.
+  friend class internal::RootView;
+
   View* FindTargetForKeyEvent(View* root, const ui::KeyEvent& key);
   View* FindTargetForScrollEvent(View* root, const ui::ScrollEvent& scroll);
 
+  virtual View* FindTargetForGestureEvent(View* root,
+                                          const ui::GestureEvent& gesture);
+  virtual ui::EventTarget* FindNextBestTargetForGestureEvent(
+      ui::EventTarget* previous_target,
+      const ui::GestureEvent& gesture);
+
   // ViewTargeter does not own the |delegate_|, but |delegate_| must
   // outlive the targeter.
   ViewTargeterDelegate* delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(ViewTargeter);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_VIEW_TARGETER_H_