Fix navigation of chrome://oobe/login.

tools/telemetry/telemetry/core/chrome/misc_web_contents_backend.py

Index: tools/telemetry/telemetry/core/chrome/misc_web_contents_backend.py
===================================================================
--- tools/telemetry/telemetry/core/chrome/misc_web_contents_backend.py	(revision 0)
+++ tools/telemetry/telemetry/core/chrome/misc_web_contents_backend.py	(revision 0)
@@ -0,0 +1,46 @@
+# Copyright (c) 2012 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+import httplib
+import json
+import socket
+import urllib2
+
+from telemetry.core import exceptions
+from telemetry.core import web_contents
+from telemetry.core.chrome import inspector_backend
+
+class MiscWebContentsBackend(object):
+  """Provides acccess to chrome://oobe/login page, which is neither an extension
+  nor a tab."""
+  def __init__(self, browser_backend):
+    self._browser_backend = browser_backend
+
+  def GetOobe(self):
+    oobe_web_contents_info = self._FindWebContentsInfo('chrome://oobe/login')
+    if oobe_web_contents_info:
+      debugger_url = oobe_web_contents_info.get('webSocketDebuggerUrl')
+      if debugger_url:
+        inspector = self._CreateInspectorBackend(debugger_url)
+        return web_contents.WebContents(inspector)
+    return None
+
+  def _CreateInspectorBackend(self, debugger_url):
+    return inspector_backend.InspectorBackend(self._browser_backend.browser,
+                                              self._browser_backend,
+                                              debugger_url)
+
+  def _ListWebContents(self, timeout=None):
+    try:
+      data = self._browser_backend.Request('', timeout=timeout)
+      return json.loads(data)
+    except (socket.error, httplib.BadStatusLine, urllib2.URLError):
+      if not self._browser_backend.IsBrowserRunning():
+        raise exceptions.BrowserGoneException()
+      raise exceptions.BrowserConnectionGoneException()
+
+  def _FindWebContentsInfo(self, url):
+    for web_contents_info in self._ListWebContents():
+      if web_contents_info.get('url') == url:
+        return web_contents_info
+    return None