Support targeting for gestures in ViewTargeter

ui/views/view_targeter.h

Index: ui/views/view_targeter.h
diff --git a/ui/views/view_targeter.h b/ui/views/view_targeter.h
index ee4e7c3dcf1c6beddfca8cfa82aeaafa6975f4a3..79f5ca6e200f44031fa5ffff1ae1da44a0abc517 100644
--- a/ui/views/view_targeter.h
+++ b/ui/views/view_targeter.h
@@ -10,6 +10,10 @@
 
 namespace views {
 
+namespace internal {
+class RootView;
+}  // namespace internal
+
 class View;
 class ViewTargeterDelegate;
 
@@ -40,9 +44,19 @@ class VIEWS_EXPORT ViewTargeter : public ui::EventTargeter {
       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_;