Added webdriver support for App v2.

chrome/test/webdriver/test/packaged_app_extension/manifest.json

Index: chrome/test/webdriver/test/packaged_app_extension/manifest.json
diff --git a/chrome/test/webdriver/test/packaged_app_extension/manifest.json b/chrome/test/webdriver/test/packaged_app_extension/manifest.json
new file mode 100644
index 0000000000000000000000000000000000000000..c242e45a23cdeec7a4d7a5aa846b7abb49773481
--- /dev/null
+++ b/chrome/test/webdriver/test/packaged_app_extension/manifest.json
@@ -0,0 +1,11 @@
+{
+  "name": "Packaged app extension",
+  "manifest_version": 2,
+  "version": "1.0",
+  "app": {
+    "background": {

[kkania, 2012/08/09 22:04:49]

just to make sure I understand, unlike extensions, app background pages aren't
started until the user clicks the app icon?

[Danh Nguyen, 2012/08/10 16:35:09]

True, they're not loaded until the user launches the app.  Chrome then informs
the add to open its window.

+      "scripts": [ "bg.js" ]
+    }
+  },
+  "permissions": [ "experimental" ]
+}