Land Recent QUIC Changes.

Add more information to LOG(DFATAL) in QUIC's tcp_loss_algorithm.

Merge internal change: 77370712
https://codereview.chromium.org/644123003/

Fix a bug where packet received times aren't sent if the approximate now
time is less than the packet's actual receive time.

Merge internal change: 77056400
https://codereview.chromium.org/643313003/

Change the pacing sender to always pacing the initial burst, even when
an RTT sample hasn't been taken.

Merge internal change: 77004656
https://codereview.chromium.org/644233002/

Set the server's idle timeout to 2s longer than the negotiated value(30s
by default) instead of 1s, in order to prevent failed requests.

Merge internal change: 76821863
https://codereview.chromium.org/651463004/

Call SetDefaults from the QuicConfig constructor instead of requiring
all callers to do so.

Merge internal change: 76709273
https://codereview.chromium.org/647933002

Allow the number of undecryptable QUIC packets buffered before the
CHLO/SHLO to be configured in QuicConfig.

Merge internal change: 76707156

On chromium side: set max undecryptable packets to the initial
congestion window size in QuicStreamFactory.

https://codereview.chromium.org/647923002/

QUIC - Minor formatting changes to keep in sync with internal source.

Found these changes while merging changes from chromium CLs:
  605733006, 605163004

  Chromium code review URL:
      https://codereview.chromium.org/605733006/
      https://codereview.chromium.org/605163004/

Merge internal change: 76636673
https://codereview.chromium.org/651513002/

Remove QuicSentPacketManager::DebugVisitor's OnSentPacket, since it's
redundant to QuicConnection::DebugVisitor's OnPacketSent.

Refactored QuicConnection::DebugVisitor's OnPacketSent in order to add
necessary fields for the trace... visitor.

Merge internal change: 76595983
https://codereview.chromium.org/627583002/

QUIC: if client provides an STK which includes CachedNetworkParams, then
store these and echo them back in future STKs if we have no newer
estimate to send. Flag protected behind disabled
FLAGS_quic_store_cached_network_params_from_chlo.

This is the followup to adding timestamp to the SourceAddressToken proto.
This allowed us to copy a previously provided CachedNetworkParams into
new STKs without losing timestamp data.

It also paves the way for recording BW estimate accuracy in the server:
we now have the client's provided BW estimate stored per connection, so
we can compare against BW that we see on the new connection (this will
be in a future CL).

Merge internal change: 76455340

chromium: this code doesn't impact client side code because we don't
parse SourceAddressToken (we keep it as a string). For QUIC server,
we are not parsing optional cached_network_params. Added a TODO
to convert SourcAddressToken and CachedNetworkParams to protobuf.

https://codereview.chromium.org/623003002/

R=rch@chromium.org

Review URL: https://codereview.chromium.org/648933003

Cr-Commit-Position: refs/heads/master@{#299380}

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