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 b21b4d026a4791408a64a241d79c9dbaa3370e8e..963c9f2f7186f291d3d395eed0178dddb1e85a53 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -26503,6 +26503,18 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Net.CertificateTransparency.CanInclusionCheckSCT"
+    enum="BooleanCanBeChecked">
+  <owner>eranm@chromium.org</owner>
+  <summary>
+    Whether an observed Signed Certificate Timestamp (SCT) is covered by the
+    Signed Tree Head (STH) currently known to this client, meaning the timestamp
+    from the SCT is less than the timestamp from the STH + the log's Maximum
+    Merge Delay (24 hours). In that case it can be checked for inclusion
+    immediately without waiting for a new STH.
+  </summary>
+</histogram>
+
 <histogram name="Net.CertificateTransparency.MainFrameValidSCTCount">
   <owner>eranm@chromium.org</owner>
   <summary>
@@ -67288,6 +67300,11 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <int value="1" label="Hit"/>
 </enum>
 
+<enum name="BooleanCanBeChecked" type="int">

[Alexei Svitkine (slow), 2016/07/20 15:14:04]

Nit: Since this is a very specific enum, name it appropriately. (e.g.
STHCanBeChecked). Otherwise, BooleanCanBeChecked sounds like something someone
else could re-use if going by just the name.

[Eran Messeri, 2016/07/20 19:44:08]

Done.

+  <int value="0" label="Requires newer STH"/>
+  <int value="1" label="Can be checked for inclusion"/>
+</enum>
+
 <enum name="BooleanCanceled" type="int">
   <int value="0" label="Not Canceled"/>
   <int value="1" label="Canceled"/>