Land Recent QUIC changes.

Fix to change SendAlarm so it does not not try to write if
the connection is write blocked.  Chrome b/303981.

Merge internal change: 53845630


Fixing minor nits (added using std::pair).

Merge internal change: 53257699

Increasing the maximum tcp congestion window to 200 packets from 100.

Merge internal change: 53185276

Add a DCHECK to ensure the sent packet sequence number never goes down
and separate the send alarm into a send alarm and a resume writes
alarm to be used when the socket is still writable an there may be
more pending data to write.

Merge internal change: 53050471

Merged quic_epoll_connection_helper_test.cc from internal code.

Minor nit fixes.

Merge internal change: 53048224

Move QuicAckNotifierManager from QuicConnection to
QuicSentPacketManager.

Merge internal change: 53036185

[email protected], [email protected], [email protected]

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=226390

Review URL: https://codereview.chromium.org/25443002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@227396 0039d316-1c4b-4281-b951-d872f2087c98
12 files changed