Add new certificateProvider extension API.

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 119916b2a9cace8e80c38aa72c5db4ebd2f7d724..ab1cb4b46fa92fc0eba372c96ff179d6d580ce9b 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -57852,6 +57852,8 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <int value="381" label="CAST_DEVICES_PRIVATE_ON_UPDATE_DEVICES_REQUESTED"/>
   <int value="382" label="CAST_DEVICES_PRIVATE_ON_START_CAST"/>
   <int value="383" label="CAST_DEVICES_PRIVATE_ON_STOP_CAST"/>
+  <int value="384" label="CERTIFICATEPROVIDER_ON_CERTIFICATES_REQUESTED"/>
+  <int value="385" label="CERTIFICATEPROVIDER_ON_SIGN_DIGEST_REQUESTED"/>
 </enum>
 
 <enum name="ExtensionFileWriteResult" type="int">
@@ -58975,6 +58977,8 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <int value="1077" label="BROWSINGDATA_REMOVECACHESTORAGE"/>
   <int value="1078" label="VIRTUALKEYBOARDPRIVATE_SETKEYBOARDSTATE"/>
   <int value="1079" label="VIRTUALKEYBOARDPRIVATE_SETHOTRODKEYBOARD"/>
+  <int value="1080" label="CERTIFICATEPROVIDERINTERNAL_REPORTSIGNATURE"/>
+  <int value="1081" label="CERTIFICATEPROVIDERINTERNAL_REPORTCERTIFICATES"/>
 </enum>
 
 <enum name="ExtensionInstallCause" type="int">