Add gesture target fuzzing to views

ui/views/view.h

Index: ui/views/view.h
diff --git a/ui/views/view.h b/ui/views/view.h
index 21fb1a0b775646284d73fe45001a6440aec2f0d9..e28eac8a370158ae221a10a84270e3967eecbd99 100644
--- a/ui/views/view.h
+++ b/ui/views/view.h
@@ -502,6 +502,13 @@ class VIEWS_EXPORT View : public ui::LayerDelegate,
   // Returns the deepest visible descendant that contains the specified point.
   virtual View* GetEventHandlerForPoint(const gfx::Point& point);
 
+  // Considers the bounding rectangles of all descendant views that have at
+  // least views::kFuzzingOverlapPercentage of their area covered by
+  // |touch_rect|. Among these rectangles, choose one that is closest to the
+  // center line of |touch_rect| and return its corresponding View. Note that
+  // |touch_rect| is in screen coordinates.
+  virtual View* GetEventHandlerForRect(const gfx::Rect& touch_rect);
+
   // Return the cursor that should be used for this view or the default cursor.
   // The event location is in the receiver's coordinate system. The caller is
   // responsible for managing the lifetime of the returned object, though that