Reject unadvertised encodings

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 c853206dde107725afefe5f5ae6ba1ff2c52df8a..03e670ea64dfb8403094ec353b5b61d646aa4fae 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -103795,6 +103795,17 @@ from previous Chrome versions.
   <int value="5" label="SDCHPossible"/>
   <int value="6" label="Invalid"/>
   <int value="7" label="None"/>
+  <int value="8" label="Rejected">
+    Unlike other values, this one is reported from HttpNetworkTransaction in
+    case when unadvertised, but known encoding appears in
+    &quot;Content-Encoding&quot;, and is thus not comparable with the other
+    values, which are potentially returned from cached entries.
+  </int>
+  <int value="9" label="Unknown">
+    Reported from URLRequestHttpJob::SetUpSourceStream when unknown encoding
+    appears in &quot;Content-Encoding&quot; header. Despite of being reported in

[Steven Holte, 2017/04/05 17:45:42]

unknown -> an unknown
in "Content-Encoding" header -> in a "Content-Encoding"
header
Despite of being -> Despite being
event does not cause CONTENT_DECODING_FAILED error -> this does not cause a
CONTENT_DECODING_FAILED error.

[eustas, 2017/04/06 08:06:09]

Done. Thanks.

+    this histogram, event does not cause CONTENT_DECODING_FAILED error.
+  </int>
 </enum>
 
 <enum name="NetInternalsUiFeature" type="int">