Evgeny would like sample traffic, but not sure how to do this or if it would really be useful (need to reply on this thread - https://groups.google.com/a/google.com/forum/#!topic/contextual-search-eng/y5N-4dtn-O8)

We've added a throttling mechanism, documented at https://go/cs-unity-throttle.

Actually I'd like to add a UMA Histogram for when we throttle.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/04d4389adfd1a1343bc70b6c98c1c73b8f810ea9

commit 04d4389adfd1a1343bc70b6c98c1c73b8f810ea9
Author: Donn Denman <donnd@chromium.org>
Date: Tue Sep 11 22:18:52 2018

[TTS] Add Unified Consent integration histograms.

Aids with the integration of Contextual Search with Unified Consent by
recording whether the user was previously undecided when their
preference gets changed due to Unified Consent, and whether to throttle
for every request and when throttling is in effect.

BUG= 829597 

Change-Id: I28c10e10faee25dd6741243c4560d9ed74fa75ef
Reviewed-on: https://chromium-review.googlesource.com/1214402
Reviewed-by: Steven Holte <holte@chromium.org>
Reviewed-by: Theresa <twellington@chromium.org>
Commit-Queue: Donn Denman <donnd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#590504}
[modify] https://crrev.com/04d4389adfd1a1343bc70b6c98c1c73b8f810ea9/chrome/android/java/src/org/chromium/chrome/browser/contextualsearch/ContextualSearchPreferenceHelper.java
[modify] https://crrev.com/04d4389adfd1a1343bc70b6c98c1c73b8f810ea9/chrome/android/java/src/org/chromium/chrome/browser/contextualsearch/ContextualSearchUma.java
[modify] https://crrev.com/04d4389adfd1a1343bc70b6c98c1c73b8f810ea9/tools/metrics/histograms/histograms.xml

I'd like to add these histograms (in #4) to M-70, should be safe to merge.

Your change meets the bar and is auto-approved for M70. Please go ahead and merge the CL to branch 3538 manually. Please contact milestone owner if you have questions.
Owners: benmason@(Android), kariahda@(iOS), geohsu@(ChromeOS), abdulsyed@(Desktop)

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/dd0abf1c8bffd59900fcb17cd203b0269929f991

commit dd0abf1c8bffd59900fcb17cd203b0269929f991
Author: Donn Denman <donnd@chromium.org>
Date: Thu Sep 13 17:53:26 2018

[TTS] Add Unified Consent integration histograms.

Aids with the integration of Contextual Search with Unified Consent by
recording whether the user was previously undecided when their
preference gets changed due to Unified Consent, and whether to throttle
for every request and when throttling is in effect.

BUG= 829597 

Change-Id: I28c10e10faee25dd6741243c4560d9ed74fa75ef
Reviewed-on: https://chromium-review.googlesource.com/1214402
Reviewed-by: Steven Holte <holte@chromium.org>
Reviewed-by: Theresa <twellington@chromium.org>
Commit-Queue: Donn Denman <donnd@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#590504}(cherry picked from commit 04d4389adfd1a1343bc70b6c98c1c73b8f810ea9)
Reviewed-on: https://chromium-review.googlesource.com/1225102
Reviewed-by: Donn Denman <donnd@chromium.org>
Cr-Commit-Position: refs/branch-heads/3538@{#373}
Cr-Branched-From: 79f7c91a2b2a2932cd447fa6f865cb6662fa8fa6-refs/heads/master@{#587811}
[modify] https://crrev.com/dd0abf1c8bffd59900fcb17cd203b0269929f991/chrome/android/java/src/org/chromium/chrome/browser/contextualsearch/ContextualSearchPreferenceHelper.java
[modify] https://crrev.com/dd0abf1c8bffd59900fcb17cd203b0269929f991/chrome/android/java/src/org/chromium/chrome/browser/contextualsearch/ContextualSearchUma.java
[modify] https://crrev.com/dd0abf1c8bffd59900fcb17cd203b0269929f991/tools/metrics/histograms/histograms.xml