tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index d1800f8261a89d2e3f42ae6331697e1debe91683..b572efe6f50f8540a32eb47c9919f0738f17c52d 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -75904,6 +75904,16 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Translate.CompactInfobar.TranslationsPerPageCount">

[Ilya Sherman, 2017/05/16 05:54:38]

Optional nit: I'd omit the word "Count" in this metric name.

[Ilya Sherman, 2017/05/16 05:54:38]

nit: Please add units="translations"

[ramyasharma, 2017/05/16 06:34:21]

Done.

[ramyasharma, 2017/05/16 06:34:21]

Done.

+  <owner>ramyasharma@google.com</owner>
+  <summary>
+    Records the total number of times a page was translated. Reverting back to

[Ilya Sherman, 2017/05/16 05:54:38]

Please document when this metric is recorded.  It looks like you currently
record a value every time a translation occurs.  That means that if a user
translates a page 5 times, you'll record each of 1, 2, 3, 4, and 5 to this
histogram.   If you could instead implement the metric to only record '5', that
would be better.  If that's infeasible, then please at least document the
behavior.

[ramyasharma, 2017/05/16 06:34:21]

Yes, that is correct. It's not feasible to record only the final translation
number due to various reasons, so we fall back to recording each time, so that 1
means >= 1 translations, 2 is >=2 and so on.Have updated the behaviour. Let me
know if this is clear?

+    original language counts as one translation, and changing the target
+    language results in 1 translation. This will give us a sense of how often

[Ilya Sherman, 2017/05/16 05:54:38]

The second sentence is not very clear to me.  I think you're using almost
identical language to describe two different events, but I'm not entirely sure. 
Here's my guess at what you mean:

Case A: A user translates a page from French to English, and then reverts back
to French.  A total of 1 translations are emitted to this histogram.

Case B: A user translates a page from French to English, and then to Spanish.  A
total of 2 translations are emitted to this histogram.

Is my understanding of the above two correct?  Or is 2 emitted in each case? 
Also, I'm confused about the cases below:

Case C: A user translates a page from French to English, then to Spanish, then
back to English.  A total of ??? translations are emitted to this histogram.

Case D: A user translates a page from French to English, then to Spanish, then
back to French.  A total of ??? translations are emitted. to this histogram.

Please update the description to clarify all of these details.

[ramyasharma, 2017/05/16 06:34:21]

I have updated the behaviour. Let me know if this is clear?

+    people try out several translates on a page, or flip back and forth.
+  </summary>
+</histogram>
+
 <histogram name="Translate.ContentLanguage" enum="TranslateLanguage">
   <owner>kenjibaheux@google.com</owner>
   <summary>