Get the title for extensions.

AppService doesn't have the extensions information, so the tilte for
extensions on shelf is empty when launch extensions.

Modify LauncherControllerHelper::GetAppTitle. If the app can't be found
from AppService, call extensions to get the title.

BUG=1059732

Change-Id: Ib2766671e85c049c17c98f0a524e79f457706979
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2096416Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Nancy Wang <nancylingwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748913}

chrome/browser/ui/ash/launcher/launcher_controller_helper.cc

@@ -143,13 +143,27 @@ base::string16 LauncherControllerHelper::GetAppTitle(
 
   apps::AppServiceProxy* proxy =
       apps::AppServiceProxyFactory::GetForProfile(profile);
-  if (!proxy)
-    return base::string16();
-
+  if (proxy) {
     std::string name;
     proxy->AppRegistryCache().ForOneApp(
-      app_id, [&name](const apps::AppUpdate& update) { name = update.Name(); });
+        app_id,
+        [&name](const apps::AppUpdate& update) { name = update.Name(); });
+    if (!name.empty())
       return base::UTF8ToUTF16(name);
+  }
+
+  // Get the title for the extension which is not managed by AppService.
+  extensions::ExtensionRegistry* registry =
+      extensions::ExtensionRegistry::Get(profile);
+  if (!registry)
+    return base::string16();
+
+  auto* extension = registry->GetExtensionById(
+      app_id, extensions::ExtensionRegistry::EVERYTHING);
+  if (extension)
+    return base::UTF8ToUTF16(extension->name());
+
+  return base::string16();
 }
 
 std::string LauncherControllerHelper::GetAppID(content::WebContents* tab) {