Consolidate two IsArcWindow functions to reduce code duplication

components/arc/arc_util.h

Index: components/arc/arc_util.h
diff --git a/components/arc/arc_util.h b/components/arc/arc_util.h
index a9e69d36878ecbaae809ccdd1c2cb6a630a5eed6..ce597f72442285c738a94078cca866f74e1ed963 100644
--- a/components/arc/arc_util.h
+++ b/components/arc/arc_util.h
@@ -9,6 +9,10 @@
 // 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
@@ -66,6 +70,10 @@ bool IsArcAllowedForActiveDirectoryUsers();
 // 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_