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 9482cefa86b0b5b57bc7dc12250bbc8602425846..8726e1edb8cf0b8be3d4de9a702fe3f4c84b073d 100644
--- a/ui/views/view.h
+++ b/ui/views/view.h
@@ -502,6 +502,14 @@ class VIEWS_EXPORT View : public ui::LayerDelegate,
   // Returns the deepest visible descendant that contains the specified point.
   virtual View* GetEventHandlerForPoint(const gfx::Point& point);

[sky, 2012/08/02 15:52:08]

Add a comment to this that if overriding GetEventHandlerForPoint you'll need to
override this GetEventHandlerForRect.

[tdanderson, 2012/08/02 18:11:37]

Done.

 
+  // Considers the bounding rectangles of all leaf 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

[sky, 2012/08/02 15:52:08]

touch_rect -> rect

Why is the rect in screen coordinates? It should be location coordinates as is
GetEventHandleForPoint and most other methods.

[tdanderson, 2012/08/02 18:11:37]

Done.
I decided to keep everything in screen coordinates because
GetEventHandlerForRect makes calls to PercentCoveredBy and
DistanceSquaredFromCenterLineToPoint, which both require a common coordinate
system for their parameters. This way seems to require less work in switching
back and forth between different coordinate systems.

+  // center line of |touch_rect| and return its corresponding View. If there
+  // are no such rectangles, NULL is returned. 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