The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/76342abff9abbb4413572ebb27d8a1dd6a5c91b6

commit 76342abff9abbb4413572ebb27d8a1dd6a5c91b6
Author: zea <zea@chromium.org>
Date: Tue Nov 01 17:26:04 2016

[GCM] Reset store on checkin rejection and add checkin state to internals

First, this now handles cases where checkin is rejected for a non-retryable
reason by resetting the GCM store. UMA data shows that this is happening
less than 1% of the time, and likely implies profile corruption. Currently
we do not have any way to recover from this state.

Secondly, to help diagnose other checkin issues, I've also added checkin
information to chrome://gcm-internals. Namely last checkin time and next
scheduled checkin time. Recording is now on by default to make it easier
to record checkin events.

BUG= 659373 

Review-Url: https://codereview.chromium.org/2450383003
Cr-Commit-Position: refs/heads/master@{#429033}

[modify] https://crrev.com/76342abff9abbb4413572ebb27d8a1dd6a5c91b6/components/gcm_driver/BUILD.gn
[modify] https://crrev.com/76342abff9abbb4413572ebb27d8a1dd6a5c91b6/components/gcm_driver/gcm_client.h
[modify] https://crrev.com/76342abff9abbb4413572ebb27d8a1dd6a5c91b6/components/gcm_driver/gcm_client_impl.cc
[modify] https://crrev.com/76342abff9abbb4413572ebb27d8a1dd6a5c91b6/components/gcm_driver/gcm_client_impl.h
[modify] https://crrev.com/76342abff9abbb4413572ebb27d8a1dd6a5c91b6/components/gcm_driver/gcm_client_impl_unittest.cc
[modify] https://crrev.com/76342abff9abbb4413572ebb27d8a1dd6a5c91b6/components/gcm_driver/gcm_internals_constants.cc
[modify] https://crrev.com/76342abff9abbb4413572ebb27d8a1dd6a5c91b6/components/gcm_driver/gcm_internals_constants.h
[modify] https://crrev.com/76342abff9abbb4413572ebb27d8a1dd6a5c91b6/components/gcm_driver/gcm_internals_helper.cc
[modify] https://crrev.com/76342abff9abbb4413572ebb27d8a1dd6a5c91b6/components/gcm_driver/resources/gcm_internals.html
[modify] https://crrev.com/76342abff9abbb4413572ebb27d8a1dd6a5c91b6/components/gcm_driver/resources/gcm_internals.js
[modify] https://crrev.com/76342abff9abbb4413572ebb27d8a1dd6a5c91b6/google_apis/gcm/engine/checkin_request.cc
[modify] https://crrev.com/76342abff9abbb4413572ebb27d8a1dd6a5c91b6/google_apis/gcm/engine/checkin_request.h
[modify] https://crrev.com/76342abff9abbb4413572ebb27d8a1dd6a5c91b6/google_apis/gcm/engine/checkin_request_unittest.cc
[modify] https://crrev.com/76342abff9abbb4413572ebb27d8a1dd6a5c91b6/google_apis/gcm/tools/mcs_probe.cc

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/e6e40418c02f84417b973026ec6d7e515a4c46ba

commit e6e40418c02f84417b973026ec6d7e515a4c46ba
Author: zea <zea@chromium.org>
Date: Fri Nov 04 23:05:45 2016

[GCM] Update ResetStore histograms

Adds a new GCM.ResetStoreReason histogram, and renames the old GCM.ResetStore
histogram to GCM.ResetStoreError (for clarity).

BUG= 659373 

Review-Url: https://codereview.chromium.org/2471433003
Cr-Commit-Position: refs/heads/master@{#430056}

[modify] https://crrev.com/e6e40418c02f84417b973026ec6d7e515a4c46ba/components/gcm_driver/gcm_client_impl.h
[modify] https://crrev.com/e6e40418c02f84417b973026ec6d7e515a4c46ba/tools/metrics/histograms/histograms.xml