Proof of concept for running extension API stack through dev tools.

tools/telemetry/telemetry/cros_browser_backend.py

Index: tools/telemetry/telemetry/cros_browser_backend.py
diff --git a/tools/telemetry/telemetry/cros_browser_backend.py b/tools/telemetry/telemetry/cros_browser_backend.py
index 5fed131c19c9a64fdca878bd9b51620ceaf08ee9..38423379d294e23ea8947fa6ec309f37023f5328 100644
--- a/tools/telemetry/telemetry/cros_browser_backend.py
+++ b/tools/telemetry/telemetry/cros_browser_backend.py
@@ -2,7 +2,6 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 import logging
-import os
 import socket
 import subprocess
 
@@ -18,8 +17,7 @@ class CrOSBrowserBackend(browser_backend.BrowserBackend):
     self._cri = cri
     self._browser_type = browser_type
 
-    self._remote_debugging_port = self._cri.GetRemotePort()
-    self._login_ext_dir = '/tmp/chromeos_login_ext'
+    self._remote_debugging_port = 8666     # self._cri.GetRemotePort()
 
     # Ensure the UI is running and logged out.
     self._RestartUI()
@@ -30,23 +28,6 @@ class CrOSBrowserBackend(browser_backend.BrowserBackend):
       self._cri.GetCmdOutput(
           ['cryptohome', '--action=remove', '--force', '--user=test@test.test'])
 
-    # Push a dummy login extension to the device.
-    # This extension automatically logs in as test@test.test
-    logging.info('Copying dummy login extension to the device')
-    cri.PushFile(
-        os.path.join(os.path.dirname(__file__), 'chromeos_login_ext'), '/tmp/')
-    cri.GetCmdOutput(['chown', '-R', 'chronos:chronos', self._login_ext_dir])
-
-    # Restart Chrome with the login extension and remote debugging.
-    logging.info('Restarting Chrome with flags and login')
-    args = ['dbus-send', '--system', '--type=method_call',
-            '--dest=org.chromium.SessionManager',
-            '/org/chromium/SessionManager',
-            'org.chromium.SessionManagerInterface.EnableChromeTesting',
-            'boolean:true',
-            'array:string:"%s"' % '","'.join(self.GetBrowserStartupArgs())]
-    cri.GetCmdOutput(args)
-
     # Find a free local port.
     tmp = socket.socket()
     tmp.bind(('', 0))
@@ -70,9 +51,16 @@ class CrOSBrowserBackend(browser_backend.BrowserBackend):
       self.Close()
       raise
 
-
     logging.info('Browser is up!')
 
+  def _InstallExtension(self, local_path, device_path):
+    # Push a dummy login extension to the device.
+    # This extension automatically logs in as test@test.test
+    logging.info('Copying extension from "%s" to the device "%s"' %
+                 (local_path, device_path))
+    self._cri.PushFile(local_path, '/tmp/')
+    self._cri.GetCmdOutput(['chown', '-R', 'chronos:chronos', device_path])
+
   def GetBrowserStartupArgs(self):
     args = super(CrOSBrowserBackend, self).GetBrowserStartupArgs()
 
@@ -86,6 +74,7 @@ class CrOSBrowserBackend(browser_backend.BrowserBackend):
             '--force-compositing-mode',
             '--remote-debugging-port=%i' % self._remote_debugging_port,
             '--auth-ext-path=%s' % self._login_ext_dir,
+            '--load-component-extension=%s' % self._auto_ext_dir,
             '--start-maximized'])
 
     return args
@@ -137,10 +126,6 @@ class CrOSBrowserBackend(browser_backend.BrowserBackend):
       self._forwarder.Close()
       self._forwarder = None
 
-    if self._login_ext_dir:
-      self._cri.RmRF(self._login_ext_dir)
-      self._login_ext_dir = None
-
     self._cri = None
 
   def IsBrowserRunning(self):