Add --draw-view-bounds-rects to draw bounds rects for all views.

ui/views/views_switches.cc

 // Copyright (c) 2013 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/views/views_switches.h"
 
 #include "base/command_line.h"
 #include "build/build_config.h"
 
 namespace views {
 namespace switches {
 
 // Please keep alphabetized.
 
 // Specifies if a heuristic should be used to determine the most probable
 // target of a gesture, where the touch region is represented by a rectangle.
 const char kDisableViewsRectBasedTargeting[] =
     "disable-views-rect-based-targeting";
 
+// Draws a semitransparent rect to indicate the bounds of each view.
+const char kDrawViewBoundsRects[] = "draw-view-bounds-rects";
+
 bool IsRectBasedTargetingEnabled() {
 #if defined(OS_CHROMEOS) || defined(OS_WIN) || defined(OS_LINUX)
   return !base::CommandLine::ForCurrentProcess()->HasSwitch(
       kDisableViewsRectBasedTargeting);
 #else
   return false;
 #endif
 }
 
 }  // namespace switches
 }  // namespace views