implement sign in dialog

chrome/test/data/extensions/platform_apps/minimal/manifest.json

Index: chrome/test/data/extensions/platform_apps/minimal/manifest.json
===================================================================
--- chrome/test/data/extensions/platform_apps/minimal/manifest.json	(revision 147566)
+++ chrome/test/data/extensions/platform_apps/minimal/manifest.json	(working copy)
@@ -3,7 +3,6 @@
   "version": "1",
   "manifest_version": 2,
   "permissions": [
-    "experimental",

[Mihai Parparita -not on Chrome, 2012/07/20 18:02:32]

This is still necessary, the minimal app listens for the launch event, which is
experimental:

http://src.chromium.org/viewvc/chrome/trunk/src/chrome/test/data/extensions/p...

You can either add the experimental flag to the command-line when running your
test, or create a new minimal app for your test that is even simpler (doesn't
actually create windows).

[Munjal (Google), 2012/07/20 18:54:15]

Done. I added a new minimal app for oauth2 tests.

     "appWindow"
   ],
   "app": {