Sync the launch type pref for apps.

chrome/browser/extensions/launch_util.h

Index: chrome/browser/extensions/launch_util.h
diff --git a/chrome/browser/extensions/launch_util.h b/chrome/browser/extensions/launch_util.h
index 0cdfb72fa484d4244b6c6822d1e399f4233055cd..cd5f69392849486e541d53d23bae33f71bd51c83 100644
--- a/chrome/browser/extensions/launch_util.h
+++ b/chrome/browser/extensions/launch_util.h
@@ -9,6 +9,8 @@
 
 #include "chrome/common/extensions/extension_constants.h"
 
+class ExtensionService;
+
 namespace extensions {
 
 class Extension;
@@ -21,8 +23,13 @@ class ExtensionPrefs;
 LaunchType GetLaunchType(const ExtensionPrefs* prefs,
                          const Extension* extension);
 
-// Sets an extension's launch type preference.
-void SetLaunchType(ExtensionPrefs* prefs,
+// Returns the LaunchType that is set in the prefs. Returns LAUNCH_TYPE_INVALID
+// if no value is set in prefs.
+LaunchType GetLaunchTypePrefValue(const ExtensionPrefs* prefs,
+                                  const std::string& extension_id);
+
+// Sets an extension's launch type preference and syncs the value if necessary.
+void SetLaunchType(ExtensionService* prefs,
                    const std::string& extension_id,
                    LaunchType launch_type);