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

tools/telemetry/telemetry/browser.py

Index: tools/telemetry/telemetry/browser.py
diff --git a/tools/telemetry/telemetry/browser.py b/tools/telemetry/telemetry/browser.py
index d33c84701591dc94fb6e23a4cbe88907d45dffb0..26f0c871d760510869cec02a64bef92fec79b7c3 100644
--- a/tools/telemetry/telemetry/browser.py
+++ b/tools/telemetry/telemetry/browser.py
@@ -61,6 +61,12 @@ class Browser(object):
   def ConnectToNthTab(self, index):
     return self._backend.ConnectToNthTab(self, index)
 
+  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):
     if self._wpr_server:
       self._wpr_server.Close()