The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/0b46091cb37b8fdd73a02675e2ab86850d51cb09

commit 0b46091cb37b8fdd73a02675e2ab86850d51cb09
Author: gayane <gayane@chromium.org>
Date: Thu Apr 07 21:01:05 2016

Implement UMA log throttling for cellular connections.

For enabling UMA on cellular, a throttling logic is implemented that takes into account the weekly data usage of UMA on cellular as well as the ratio of UMA data usage over overall Chrome data traffic.

For tracking UMA data use and overall Chrome data traffic we use DataUseMeasurement class which already collects and reports similar data.

The allowed weekly UMA quota and UMA ratio are passed through as variation param.

BUG= 599586 

Review URL: https://codereview.chromium.org/1818613002

Cr-Commit-Position: refs/heads/master@{#385845}

[modify] https://crrev.com/0b46091cb37b8fdd73a02675e2ab86850d51cb09/chrome/browser/extensions/api/web_request/web_request_api_unittest.cc
[modify] https://crrev.com/0b46091cb37b8fdd73a02675e2ab86850d51cb09/chrome/browser/io_thread.cc
[modify] https://crrev.com/0b46091cb37b8fdd73a02675e2ab86850d51cb09/chrome/browser/io_thread.h
[modify] https://crrev.com/0b46091cb37b8fdd73a02675e2ab86850d51cb09/chrome/browser/metrics/chrome_metrics_service_client.cc
[modify] https://crrev.com/0b46091cb37b8fdd73a02675e2ab86850d51cb09/chrome/browser/metrics/chrome_metrics_service_client.h
[modify] https://crrev.com/0b46091cb37b8fdd73a02675e2ab86850d51cb09/chrome/browser/net/chrome_network_delegate.cc
[modify] https://crrev.com/0b46091cb37b8fdd73a02675e2ab86850d51cb09/chrome/browser/net/chrome_network_delegate.h
[modify] https://crrev.com/0b46091cb37b8fdd73a02675e2ab86850d51cb09/chrome/browser/net/chrome_network_delegate_unittest.cc
[modify] https://crrev.com/0b46091cb37b8fdd73a02675e2ab86850d51cb09/chrome/browser/profiles/profile_io_data.cc
[modify] https://crrev.com/0b46091cb37b8fdd73a02675e2ab86850d51cb09/components/components_tests.gyp
[modify] https://crrev.com/0b46091cb37b8fdd73a02675e2ab86850d51cb09/components/data_use_measurement/content/BUILD.gn
[modify] https://crrev.com/0b46091cb37b8fdd73a02675e2ab86850d51cb09/components/data_use_measurement/content/DEPS
[modify] https://crrev.com/0b46091cb37b8fdd73a02675e2ab86850d51cb09/components/data_use_measurement/content/data_use_measurement.cc
[modify] https://crrev.com/0b46091cb37b8fdd73a02675e2ab86850d51cb09/components/data_use_measurement/content/data_use_measurement.h
[modify] https://crrev.com/0b46091cb37b8fdd73a02675e2ab86850d51cb09/components/data_use_measurement/content/data_use_measurement_unittest.cc
[modify] https://crrev.com/0b46091cb37b8fdd73a02675e2ab86850d51cb09/components/metrics.gypi
[modify] https://crrev.com/0b46091cb37b8fdd73a02675e2ab86850d51cb09/components/metrics/BUILD.gn
[add] https://crrev.com/0b46091cb37b8fdd73a02675e2ab86850d51cb09/components/metrics/data_use_tracker.cc
[add] https://crrev.com/0b46091cb37b8fdd73a02675e2ab86850d51cb09/components/metrics/data_use_tracker.h
[add] https://crrev.com/0b46091cb37b8fdd73a02675e2ab86850d51cb09/components/metrics/data_use_tracker_unittest.cc
[modify] https://crrev.com/0b46091cb37b8fdd73a02675e2ab86850d51cb09/components/metrics/metrics_pref_names.cc
[modify] https://crrev.com/0b46091cb37b8fdd73a02675e2ab86850d51cb09/components/metrics/metrics_pref_names.h
[modify] https://crrev.com/0b46091cb37b8fdd73a02675e2ab86850d51cb09/components/metrics/metrics_service.cc
[modify] https://crrev.com/0b46091cb37b8fdd73a02675e2ab86850d51cb09/components/metrics/metrics_service.h
[modify] https://crrev.com/0b46091cb37b8fdd73a02675e2ab86850d51cb09/components/metrics/metrics_service_client.cc
[modify] https://crrev.com/0b46091cb37b8fdd73a02675e2ab86850d51cb09/components/metrics/metrics_service_client.h

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/0417f978064cbeda802b99b21a88d126c66ff4da

commit 0417f978064cbeda802b99b21a88d126c66ff4da
Author: gayane <gayane@chromium.org>
Date: Mon Apr 11 19:34:06 2016

Add histograms for observing UMA throttling effect.

Added a histogram for counting number of events when UMA log was not uploaded due to throttling and one more for counting number of dropped UMA logs.

Also, delete a histogram recording a connection type and actualy upload interval used to upload the previous UMA log which is not needed as we are done with the analysis of UMA logs on cellular.

BUG= 599586 

Review URL: https://codereview.chromium.org/1871733002

Cr-Commit-Position: refs/heads/master@{#386440}

[modify] https://crrev.com/0417f978064cbeda802b99b21a88d126c66ff4da/components/metrics/metrics_service.cc
[modify] https://crrev.com/0417f978064cbeda802b99b21a88d126c66ff4da/components/metrics/net/net_metrics_log_uploader.cc
[modify] https://crrev.com/0417f978064cbeda802b99b21a88d126c66ff4da/components/metrics/persisted_logs.cc
[modify] https://crrev.com/0417f978064cbeda802b99b21a88d126c66ff4da/tools/metrics/histograms/histograms.xml

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/2fd6ee9f61a7a9dd4d272358091b4f5dc68ee0d0

commit 2fd6ee9f61a7a9dd4d272358091b4f5dc68ee0d0
Author: gayane <gayane@chromium.org>
Date: Mon Apr 11 21:10:32 2016

Add uma_quota and uma_ratio to UMA_EnabledCelullarLogUpload fieldtrial testing

BUG= 599586 

Review URL: https://codereview.chromium.org/1875123003

Cr-Commit-Position: refs/heads/master@{#386472}

[modify] https://crrev.com/2fd6ee9f61a7a9dd4d272358091b4f5dc68ee0d0/testing/variations/fieldtrial_testing_config_android.json