Add offline_mode support in crxless apps

chrome/browser/extensions/convert_web_app.cc

Index: chrome/browser/extensions/convert_web_app.cc
diff --git a/chrome/browser/extensions/convert_web_app.cc b/chrome/browser/extensions/convert_web_app.cc
index 0f8bc53ef1ca32c1cec96925f3b720a5db6a6092..a114cc397929a01768ee118e7125efd377f504cb 100644
--- a/chrome/browser/extensions/convert_web_app.cc
+++ b/chrome/browser/extensions/convert_web_app.cc
@@ -103,6 +103,10 @@ scoped_refptr<Extension> ConvertWebAppToExtension(
     root->SetString(keys::kPublicKey, GenerateKey(web_app.manifest_url));
   else
     root->SetString(keys::kPublicKey, GenerateKey(web_app.app_url));
+
+  if (web_app.is_offline_enabled)
+    root->SetBoolean(keys::kOfflineEnabled, true);
+
   root->SetString(keys::kName, UTF16ToUTF8(web_app.title));
   root->SetString(keys::kVersion, ConvertTimeToExtensionVersion(create_time));
   root->SetString(keys::kDescription, UTF16ToUTF8(web_app.description));