Optimizations to fill packets better for the edsm server.
Optimizations to fill packets better for the edsm server.

Problems:
   - the SETTINGS frame was the first packet we'd send, uncorked.
     This was wasting the first packet of our cwnd.
   - uncork was overaggressive.  We now only uncork when there are
     no more packets in our queue.
   - rework the packet sizing to fully fill packets better.

Question - should I remove the MSG_MORE code now?  It seems to be an
alternative way to do corking, but it just doesn't work with the SSL layer.

BUG=none
TEST=n/a

Review URL: http://codereview.chromium.org/6327022

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@72844 0039d316-1c4b-4281-b951-d872f2087c98

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