The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/c597686a338070bcba68e9ae859b464622f30294

commit c597686a338070bcba68e9ae859b464622f30294
Author: Zhongyi Shi <zhongyi@chromium.org>
Date: Tue Jan 23 02:22:03 2018

Fix error code logged when connection migration fails.

There are also some minor comments fix.

Bug: 804048
Change-Id: Id3eeda7bcd18dc262a2020f637522e6c9317bcf7
Reviewed-on: https://chromium-review.googlesource.com/877332
Commit-Queue: Zhongyi Shi <zhongyi@chromium.org>
Reviewed-by: Ryan Hamilton <rch@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#531132}
[modify] https://crrev.com/c597686a338070bcba68e9ae859b464622f30294/components/domain_reliability/quic_error_mapping.cc
[modify] https://crrev.com/c597686a338070bcba68e9ae859b464622f30294/net/quic/chromium/quic_chromium_client_session.cc
[modify] https://crrev.com/c597686a338070bcba68e9ae859b464622f30294/net/quic/chromium/quic_stream_factory.h
[modify] https://crrev.com/c597686a338070bcba68e9ae859b464622f30294/net/quic/core/quic_error_codes.cc
[modify] https://crrev.com/c597686a338070bcba68e9ae859b464622f30294/net/quic/core/quic_error_codes.h
[modify] https://crrev.com/c597686a338070bcba68e9ae859b464622f30294/tools/metrics/histograms/enums.xml

Reopen this issue as we are analyzing connection migration performance, and need add more histograms to collect metrics.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/95f08690524627c3494a7907f11acdf3cf967fc4

commit 95f08690524627c3494a7907f11acdf3cf967fc4
Author: Cherie Shi <zhongyi@chromium.org>
Date: Fri Mar 02 20:09:45 2018

Add connection migration to different histograms based on connection migration cause.

Bug: 804048
Change-Id: If2a26d95eabba7ff986837b8fa44dea3965dba34
Reviewed-on: https://chromium-review.googlesource.com/941511
Commit-Queue: Zhongyi Shi <zhongyi@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Reviewed-by: Ryan Hamilton <rch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#540599}
[modify] https://crrev.com/95f08690524627c3494a7907f11acdf3cf967fc4/net/quic/chromium/quic_chromium_client_session.cc
[modify] https://crrev.com/95f08690524627c3494a7907f11acdf3cf967fc4/net/quic/chromium/quic_chromium_client_session.h
[modify] https://crrev.com/95f08690524627c3494a7907f11acdf3cf967fc4/net/quic/chromium/quic_stream_factory.h
[modify] https://crrev.com/95f08690524627c3494a7907f11acdf3cf967fc4/tools/metrics/histograms/histograms.xml

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/7f738657cf5049ba6205b56d9b64b8e34405cd30

commit 7f738657cf5049ba6205b56d9b64b8e34405cd30
Author: Zhongyi Shi <zhongyi@chromium.org>
Date: Fri Mar 02 21:53:48 2018

Add two new connection migration status code:
- MIGRATION_STATUS_PATH_DEGRADING_NOT_ENABLED
- MIGRATION_STATUS_TIMEOUT
to help us differentiate the case that connection failed after waiting
for new network to connect for 10 seconds.

This CL also changes labels associated with QuicConnectionMigrationStatus in histograms to make it more readable.

Bug: 804048
Change-Id: Iee870ac45ca0a038f9838a585c120846521375a4
Reviewed-on: https://chromium-review.googlesource.com/942036
Commit-Queue: Zhongyi Shi <zhongyi@chromium.org>
Reviewed-by: Ryan Hamilton <rch@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#540644}
[modify] https://crrev.com/7f738657cf5049ba6205b56d9b64b8e34405cd30/net/quic/chromium/quic_chromium_client_session.cc
[modify] https://crrev.com/7f738657cf5049ba6205b56d9b64b8e34405cd30/net/quic/chromium/quic_chromium_client_session.h
[modify] https://crrev.com/7f738657cf5049ba6205b56d9b64b8e34405cd30/tools/metrics/histograms/enums.xml

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/996e31d66f4c87058d8af9a33236b98b9df55b7e

commit 996e31d66f4c87058d8af9a33236b98b9df55b7e
Author: Zhongyi Shi <zhongyi@chromium.org>
Date: Tue May 08 07:06:45 2018

Add a histogram to collect metrics for connection migration.

Add a histogram to collect metrics on how often handshake has been confirmed
when connection migration is triggered.

Bug:  790547 , 804048
Change-Id: I593b80c1557aba30fbea52297497d9f04b51d61e
Reviewed-on: https://chromium-review.googlesource.com/1036452
Commit-Queue: Zhongyi Shi <zhongyi@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Reviewed-by: Ryan Hamilton <rch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#556712}
[modify] https://crrev.com/996e31d66f4c87058d8af9a33236b98b9df55b7e/net/quic/chromium/quic_chromium_client_session.cc
[modify] https://crrev.com/996e31d66f4c87058d8af9a33236b98b9df55b7e/net/quic/chromium/quic_chromium_client_session.h
[modify] https://crrev.com/996e31d66f4c87058d8af9a33236b98b9df55b7e/tools/metrics/histograms/enums.xml
[modify] https://crrev.com/996e31d66f4c87058d8af9a33236b98b9df55b7e/tools/metrics/histograms/histograms.xml

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/8c66a720d53cf45392d4f0474bf41f514c84988a

commit 8c66a720d53cf45392d4f0474bf41f514c84988a
Author: Zhongyi Shi <zhongyi@chromium.org>
Date: Fri May 25 23:16:13 2018

Fix connection migration cause when alternate network comes up after path is degrading.

Fix connection migration cause when alternate network comes up after path is degrading so that data is collected in Net.QuicSession.ConnectionMigration.OnPathDegrading instead of Net.QuicSession.ConnectionMigration.OnNetworkConnected.

Bug: 804048
Change-Id: Ic200bb845388ac10d414c3377d1f65d2c4fc8836
Reviewed-on: https://chromium-review.googlesource.com/1068034
Reviewed-by: Ryan Hamilton <rch@chromium.org>
Commit-Queue: Zhongyi Shi <zhongyi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#562053}
[modify] https://crrev.com/8c66a720d53cf45392d4f0474bf41f514c84988a/net/quic/chromium/quic_chromium_client_session.cc