Add Expect CT policy that gets checked on all certs

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 b49e196c5b00b894de18e3ad0c1c5d376763e77b..c05b51a0e97002c72cd6aeb0332253a53d14df05 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -26947,6 +26947,9 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 
 <histogram name="Net.SSL_EVCertificateCTCompliance"
     enum="CTRequirementCompliance">
+  <obsolete>
+    Deprecated as of 01/2016.
+  </obsolete>
   <owner>eranm@chromium.org</owner>
   <owner>rsleevi@chromium.org</owner>
   <summary>
@@ -26972,6 +26975,20 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Net.SSL_EVCTPolicyStatus" enum="EVCTPolicyStatus">
+  <owner>eranm@chromium.org</owner>
+  <owner>rsleevi@chromium.org</owner>
+  <summary>
+    The state of compliance with Certificate Transparency presence requirements
+    for each EV certificate. An EV certificate could be non-compliant (in which
+    case it loses the EV status), comply through inclusion in the EV whitelist
+    or comply with the CT certificate policy. This metric will gauge adoption
+    rate of Certificate Transparency and will help identify when the EV
+    whitelist is no longer needed. Emitted during every SSL connection
+    establishment.
+  </summary>
+</histogram>
+
 <histogram name="Net.SSL_EVWhitelistValidityForNonCompliantCert"
     enum="EVWhitelistStatus">
   <owner>eranm@chromium.org</owner>
@@ -59171,6 +59188,9 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 </enum>
 
 <enum name="CTRequirementCompliance" type="int">
+  <obsolete>
+    Deprecated 1/2016.
+  </obsolete>
   <int value="0" label="Not Compliant"/>
   <int value="1" label="Whitelisted"/>
   <int value="2" label="Has enough SCTs"/>
@@ -61618,6 +61638,12 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <int value="3" label="NON_ERROR_PAGE_URL_AND_NO_ERROR_INFO"/>
 </enum>
 
+<enum name="EVCTPolicyStatus" type="int">
+  <int value="0" label="Not Compliant"/>
+  <int value="1" label="Compliant because certificate is whitelisted"/>
+  <int value="2" label="Compliant because SCTs satisfy CT policy"/>
+</enum>
+
 <enum name="EventHitTest" type="int">
   <int value="0" label="Miss, not found in cache."/>
   <int value="1" label="Miss, explicitly avoided."/>