gesture recognizer: Fix computing the bounding box of the rectangles.

ui/base/gestures/gesture_point.cc

 // Copyright (c) 2012 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.
 
 #include "ui/base/gestures/gesture_point.h"
 
 #include <cmath>
 
 #include "base/basictypes.h"
 #include "ui/base/events.h"
@@ skipping 169 matching lines @@
   // use this to compute a more representative rectangular touch region.
   if (event.RadiusX() || event.RadiusY())
     radius = std::max(event.RadiusX(), event.RadiusY());
   else
     radius = GestureConfiguration::default_radius();
 
   gfx::Rect rect(event.GetLocation().x() - radius,
                  event.GetLocation().y() - radius,
                  radius * 2,
                  radius * 2);
-  enclosing_rect_ = enclosing_rect_.Union(rect);
+  if (IsInClickWindow(event))
+    enclosing_rect_ = enclosing_rect_.Union(rect);
+  else
+    enclosing_rect_ = rect;
 }
 
 }  // namespace ui