ChromeOS: Disable ARC when incompatible filesystem is detected.

chrome/browser/chromeos/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 CHROME_BROWSER_CHROMEOS_ARC_ARC_UTIL_H_
 #define CHROME_BROWSER_CHROMEOS_ARC_ARC_UTIL_H_
 
 // Most utility should be put in components/arc/arc_util.{h,cc}, rather than
 // here. However, some utility implementation requires other modules defined in
 // chrome/, so this file contains such utilities.
 // Note that it is not allowed to have dependency from components/ to chrome/
 // by DEPS.
 
 class Profile;
 
+namespace base {
+class FilePath;
+}
+
 namespace arc {
 
 // Returns true if ARC is allowed to run for the given profile.
 // Otherwise, returns false, e.g. if the Profile is not for the primary user,
 // ARC is not available on the device, it is in the flow to set up managed
 // account creation.
 // nullptr can be safely passed to this function. In that case, returns false.
 bool IsArcAllowedForProfile(const Profile* profile);
 
 // Disallows ARC for all profiles for testing.
@@ skipping 28 matching lines @@
 // the given |profile|.
 // TODO(hidehiko): De-couple the concept to enable ARC system and opt-in
 // to use Google Play Store. Note that there is a plan to use ARC without
 // Google Play Store, then ARC can run without opt-in.
 void SetArcPlayStoreEnabledForProfile(Profile* profile, bool enabled);
 
 // Returns whether all ARC related OptIn preferences (i.e.
 // ArcBackupRestoreEnabled and ArcLocationServiceEnabled) are managed.
 bool AreArcAllOptInPreferencesManagedForProfile(const Profile* profile);
 
+// Returns whether ARC can run on the filesystem mounted at |path|.
+// This function should not run on UI/IO threads since it accesses files.

[hidehiko, 2017/04/04 18:35:12]

Optional: how about
"This function should run on the thread where IO operation is allowed."
to be consistent with your code a bit more?

[kinaba, 2017/04/05 02:35:28]

Done.

+bool IsArcCompatibleFilesystem(const base::FilePath& path);
+
 }  // namespace arc
 
 #endif  // CHROME_BROWSER_CHROMEOS_ARC_ARC_UTIL_H_