Implement a skeleton of the Superfish interstitial

components/certificate_reporting/cert_logger.proto

Index: components/certificate_reporting/cert_logger.proto
diff --git a/components/certificate_reporting/cert_logger.proto b/components/certificate_reporting/cert_logger.proto
index 811d918a323c53f897060e02199934440d9534b6..0d4b7601ca1d0c76b3aa146c99ddba632e2373eb 100644
--- a/components/certificate_reporting/cert_logger.proto
+++ b/components/certificate_reporting/cert_logger.proto
@@ -28,12 +28,15 @@ message CertLoggerInterstitialInfo {
   // a user.
   enum InterstitialReason {
     UNKNOWN_INTERSTITIAL_REASON = 0;
-    // A standard SSL interstitial
+    // A standard SSL interstitial.
     INTERSTITIAL_SSL = 1;
-    // An interstitial alerting the user that they are in a captive portal
+    // An interstitial alerting the user that they are in a captive portal.
     INTERSTITIAL_CAPTIVE_PORTAL = 2;
-    // An interstitial telling the user to update their system clock
+    // An interstitial telling the user to update their system clock.
     INTERSTITIAL_CLOCK = 3;
+    // An interstitial telling the user to remove the Superfish software from
+    // their system.
+    INTERSTITIAL_SUPERFISH = 4;
   }
 
   // The type of interstitial that was shown