Hook up Chrome Cast sender to Cast CRL.

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 765057bf1a826efaf038ddec1f4349aec05f0568..fabaabd95b34638bd06517d0675cbfa23c60a5aa 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -5018,6 +5018,13 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Cast.Channel.Certificate" enum="CastCertificateStatus">
+  <owner>ryanchung@google.com</owner>
+  <summary>
+    Records the result of the Cast certificate verification on the Cast sender.
+  </summary>
+</histogram>
+
 <histogram name="Cast.Network.Down.Duration.In.Seconds" units="seconds">
   <owner>cast-analytics@google.com</owner>
   <summary>
@@ -72561,6 +72568,13 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <int value="4" label="Never recieved any data"/>
 </enum>
 
+<enum name="CastCertificateStatus" type="int">
+  <int value="0" label="OK"/>
+  <int value="1" label="InvalidCrl"/>
+  <int value="2" label="CertVerificationFailed"/>
+  <int value="3" label="CertRevoked"/>
+</enum>
+
 <enum name="CastOverlayEvents" type="int">
   <int value="0" label="Created"/>
   <int value="1" label="Shown"/>