Don't start PseudoTCP until underlying transport is connect.

Don't start PseudoTCP until underlying transport is connect.

Previously LibjingleTransportFactory was creating and returning
transport before the transport is connected. This means that that the
PseudoTCP was trying to start handshake on a broken transport. That was
delaying PseudoTCP/SSL when the transport takes some time to setup
(e.g. over STUN/Relay). Now LibjingleTransportFactory returns the
transport only after it becomes writable. Empirical testing shows that
this change makes connection initiation much faster in cases when NAT
traversal is required (4 vs 10 seconds).

Committed: https://crrev.com/bf00a43689c645029d918a42493ab66d8b3aa5b0
Cr-Commit-Position: refs/heads/master@{#295862}

[Sergey Ulanov, 2014-09-20 00:17:24]

sergeyu@chromium.org changed reviewers:
+ wez@chromium.org

[Wez, 2014-09-20 01:47:42]

The CQ bit was checked by wez@chromium.org

[Wez, 2014-09-20 01:47:42]

lgtm

[commit-bot: I haz the power, 2014-09-20 01:48:34]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/587943002/1

[commit-bot: I haz the power, 2014-09-20 13:15:39]

Committed patchset #1 (id:1) as a430b1083ad1023c2768fd9d95df7c858ecb2b6f

[commit-bot: I haz the power, 2014-09-20 13:16:32]

Patchset 1 (id:??) landed as
https://crrev.com/bf00a43689c645029d918a42493ab66d8b3aa5b0
Cr-Commit-Position: refs/heads/master@{#295862}