Telemetry support for extensions.

tools/telemetry/telemetry/browser.py

Index: tools/telemetry/telemetry/browser.py
===================================================================
--- tools/telemetry/telemetry/browser.py	(revision 176402)
+++ tools/telemetry/telemetry/browser.py	(working copy)
@@ -51,6 +51,10 @@
     return self._backend.supports_tab_control
 
   @property
+  def extensions(self):
+    return self._backend.extensions
+
+  @property
   def tabs(self):
     return self._backend.tabs
 
@@ -67,6 +71,12 @@
   def GetTrace(self):
     return self._backend.GetTrace()
 
+  def ConnectToExtensionPage(self, extension_id):
+    return self._backend.ConnectToExtensionPage(self, extension_id)
+
+  def ConnectToPageByUrl(self, url):
+    return self._backend.ConnectToPageByUrl(self, url)
+
   def Close(self):
     """Closes this browser."""
     if self._wpr_server: