Consolidate two IsArcWindow functions to reduce code duplication

components/arc/arc_util.h

 // Copyright 2017 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.
 
 #ifndef COMPONENTS_ARC_ARC_UTIL_H_
 #define COMPONENTS_ARC_ARC_UTIL_H_
 
 // This file contains utility to see ARC functionality status controlled by
 // outside of ARC, e.g. CommandLine flag, attribute of global data/state,
 // users' preferences, and FeatureList.
 
+namespace aura {
+class Window;
+}  // namespace aura
+
 namespace base {
 class CommandLine;
 }  // namespace base
 
 namespace arc {
 
 // Returns true if ARC is installed and the current device is officially
 // supported to run ARC.
 // Note that, to run ARC practically, it is necessary to meet more conditions,
 // e.g., ARC supports only on Primary User Profile. To see if ARC can actually
@@ skipping 37 matching lines @@
 bool IsArcKioskMode();
 
 // Returns true if it is allowed to use ARC with Active Directory managed
 // devices.
 bool IsArcAllowedForActiveDirectoryUsers();
 
 // Checks if opt-in verification was disabled by switch in command line.
 // In most cases, it is disabled for testing purpose.
 bool IsArcOptInVerificationDisabled();
 
+// Returns true if |window| is associated with an ash::WmWindow whose type is

[Luis Héctor Chávez, 2017/05/12 20:44:19]

nit: s/ash::WmWindow/aura::Window/

[Yusuke Sato, 2017/05/12 21:06:13]

Rephrased the comment. I think the original one was okay (although it was
probably too detailed.)

+// ARC_APP. When |window| is nullptr, returns false.
+bool IsArcAppWindow(aura::Window* window);
+
 }  // namespace arc
 
 #endif  // COMPONENTS_ARC_ARC_UTIL_H_