Add browser tests for enabling Google Drive offline mode on first run.

chrome/test/data/drive_first_run/app/manifest.json

Index: chrome/test/data/drive_first_run/app/manifest.json
diff --git a/chrome/test/data/drive_first_run/app/manifest.json b/chrome/test/data/drive_first_run/app/manifest.json
new file mode 100644
index 0000000000000000000000000000000000000000..f7140700a3d174add6719b1a131317042583e4bc
--- /dev/null
+++ b/chrome/test/data/drive_first_run/app/manifest.json
@@ -0,0 +1,22 @@
+{
+  "name": "Drive First Trun Test App",
+  "description": "App similar to Google Drive app for testing enabling offline mode on Chrome OS first run.",
+  "version": "1.0",
+  "offline_enabled": true,
+  "manifest_version": 2,
+  "permissions": [
+    "background"
+  ],
+  "background": {
+    "allow_js_access": false
+   },
+  "app": {
+    "launch": {
+      "web_url": "http://example.com/endpoint.html"
+    },
+    "urls": [
+      "*://example.com",
+      "*://example.com:*"
+    ]
+  }
+}