Implement syncing of bookmark apps.

chrome/browser/extensions/bookmark_app_helper.h

Index: chrome/browser/extensions/bookmark_app_helper.h
diff --git a/chrome/browser/extensions/bookmark_app_helper.h b/chrome/browser/extensions/bookmark_app_helper.h
index bef2cc9cc43c82acb6d5ef38927defeeefec42e8..d6754df4c9264ba104ab80c1100678374741c47f 100644
--- a/chrome/browser/extensions/bookmark_app_helper.h
+++ b/chrome/browser/extensions/bookmark_app_helper.h
@@ -21,6 +21,7 @@ class FaviconDownloader;
 class SkBitmap;
 
 namespace content {
+class BrowserContext;
 class WebContents;
 }
 
@@ -93,6 +94,15 @@ class BookmarkAppHelper : public content::NotificationObserver {
 void CreateOrUpdateBookmarkApp(ExtensionService* service,
                                WebApplicationInfo& web_app_info);
 
+// Retrieves the WebApplicationInfo that represents a given bookmark app.
+// |callback| will be called with a WebApplicationInfo which is populated with
+// the extension's details and icons on success and an unpopulated
+// WebApplicationInfo on failure.
+void GetWebApplicationInfoFromApp(
+    content::BrowserContext* browser_context,
+    const extensions::Extension* extension,
+    const base::Callback<void(const WebApplicationInfo&)> callback);
+
 // Returns whether the given |url| is a valid bookmark app url.
 bool IsValidBookmarkAppUrl(const GURL& url);