[telemetry] Add a webdriver backend with support for IE.

tools/telemetry/telemetry/core/wpr_server.py

Index: tools/telemetry/telemetry/core/wpr_server.py
diff --git a/tools/telemetry/telemetry/core/wpr_server.py b/tools/telemetry/telemetry/core/wpr_server.py
index 6904d98506c18a1a2eeb2dd6e5256a7b90fd7aa2..31c1b4b57551961db739b8d12881e3689db0c858 100644
--- a/tools/telemetry/telemetry/core/wpr_server.py
+++ b/tools/telemetry/telemetry/core/wpr_server.py
@@ -53,6 +53,8 @@ class ReplayServer(object):
         self._webpagereplay_local_http_port,
         self._webpagereplay_local_https_port,
         options)
+    if browser_backend.webdriver_based:

[nduca, 2013/07/30 06:49:45]

lets do this by constructing the options list first,and

browser_backend.CustomizeReplayServerWithOptions(options)

Then create the replay server.

That lets the backends have a last-second chance to customize the server, and
you avoid the webdriver_based flag

[chrisgao (Use stgao instead), 2013/07/31 19:05:41]

Good idea.
Done. But we need to override
webpagereplay.ReplayServer._AddDefaultReplayOptions.

+      self._web_page_replay.replay_options.remove('--no-dns_forwarding')
     self._web_page_replay.StartServer()
 
   def __enter__(self):