arc: Support pinned apps across Arc-enabled and Arc-disabled platforms.

chrome/browser/ui/ash/chrome_launcher_prefs.h

Index: chrome/browser/ui/ash/chrome_launcher_prefs.h
diff --git a/chrome/browser/ui/ash/chrome_launcher_prefs.h b/chrome/browser/ui/ash/chrome_launcher_prefs.h
index 38786144c1cbfc804028d74452e0d42d3b2a26ad..9921b01d7ed4e9b454cb2c17fcd90b327dd20c56 100644
--- a/chrome/browser/ui/ash/chrome_launcher_prefs.h
+++ b/chrome/browser/ui/ash/chrome_launcher_prefs.h
@@ -12,6 +12,7 @@
 
 class LauncherControllerHelper;
 class PrefService;
+class Profile;
 
 namespace base {
 class DictionaryValue;
@@ -63,7 +64,14 @@ void SetShelfAlignmentPref(PrefService* prefs,
 // Get the list of pinned apps from preferences.
 std::vector<std::string> GetPinnedAppsFromPrefs(
     const PrefService* prefs,
-    const LauncherControllerHelper* helper);
+    LauncherControllerHelper* helper);
+
+void RemovePinPosition(Profile* profile, const std::string& app_id);
+
+void SetPinPosition(Profile* profile,
+                    const std::string& app_id,
+                    const std::string& app_id_before,
+                    const std::string& app_id_after);
 
 }  // namespace ash