Add support for rect-based event targeting in 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"
+
+namespace views {
+namespace switches {
+
+// Please keep alphabetized.
+
+#if defined(OS_CHROMEOS)
+// 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 kViewsUseRectBasedTargeting[] = "views-use-rect-based-targeting";
+#endif
+
+bool UseRectBasedTargeting() {
+#if defined(OS_CHROMEOS)
+  return CommandLine::ForCurrentProcess()->
+      HasSwitch(kViewsUseRectBasedTargeting);
+#else
+  return false;
+#endif
+}
+
+}  // namespace switches
+}  // namespace views