Add experimental feature info to certificate reports

components/certificate_reporting/error_report.h

Index: components/certificate_reporting/error_report.h
diff --git a/components/certificate_reporting/error_report.h b/components/certificate_reporting/error_report.h
index 0200dcd4304be9f3230a80a0e4d327c02f46f02d..3ac3cbec2862a2da1419e19f0b311a7ec333f5a5 100644
--- a/components/certificate_reporting/error_report.h
+++ b/components/certificate_reporting/error_report.h
@@ -8,6 +8,9 @@
 #include <memory>
 #include <string>
 
+namespace base {
+struct Feature;
+}  // namespace base
 
 namespace net {
 class SSLInfo;
@@ -64,6 +67,11 @@ class ErrorReport {
   // Gets the hostname to which this report corresponds.
   const std::string& hostname() const;
 
+  // Populates the report with information about the given |feature|,
+  // including whether it is enabled or disabled and its experiment
+  // parameters.
+  void AddFeature(const base::Feature& feature);
+
  private:
   std::unique_ptr<CertLoggerRequest> cert_report_;
 };