Add is_websocket argument to SpdySessionPool::FindAvailableSession().

This will be used by HttpStreamFactoryImpl::Job to find a SpdySession
that supports Websocket over HTTP/2.

Bug: 801564
Change-Id: Idac6a13743094c59a7ffa2a43e1fed7554361dd8
Reviewed-on: https://chromium-review.googlesource.com/896982
Commit-Queue: Bence Béky <bnc@chromium.org>
Reviewed-by: Helen Li <xunjieli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#534222}
8 files changed