[Contextual Search] Add support for tap on the selection.

ui/touch_selection/touch_selection_controller.h

Index: ui/touch_selection/touch_selection_controller.h
diff --git a/ui/touch_selection/touch_selection_controller.h b/ui/touch_selection/touch_selection_controller.h
index 115dd0d637046b44aa49c42e832fc5e82489cc95..370d89c5a981afec172fe5c54d4fcb22e92ad7f7 100644
--- a/ui/touch_selection/touch_selection_controller.h
+++ b/ui/touch_selection/touch_selection_controller.h
@@ -55,11 +55,11 @@ class UI_TOUCH_SELECTION_EXPORT TouchSelectionController
 
   // To be called before forwarding a tap event. This allows automatically
   // showing the insertion handle from subsequent bounds changes.
-  void OnTapEvent();
+  bool WillHandleTapEvent(const gfx::PointF& location);
 
   // To be called before forwarding a longpress event. This allows automatically
   // showing the selection or insertion handles from subsequent bounds changes.
-  void OnLongPressEvent();
+  bool WillHandleLongPressEvent(const gfx::PointF& location);
 
   // Allow showing the selection handles from the most recent selection bounds
   // update (if valid), or a future valid bounds update.
@@ -113,6 +113,7 @@ class UI_TOUCH_SELECTION_EXPORT TouchSelectionController
 
   void ShowInsertionHandleAutomatically();
   void ShowSelectionHandlesAutomatically();
+  bool WillHandleTapOrLongPress(const gfx::PointF& location);
 
   void OnInsertionChanged();
   void OnSelectionChanged();