Add metrics for certificate report uploads

chrome/browser/safe_browsing/certificate_reporting_service.h

Index: chrome/browser/safe_browsing/certificate_reporting_service.h
diff --git a/chrome/browser/safe_browsing/certificate_reporting_service.h b/chrome/browser/safe_browsing/certificate_reporting_service.h
index 639b27e34a9372cde43e7d421b50b78601425bae..5ef016107ad9917b735f58ebae1e1914d1cbb727 100644
--- a/chrome/browser/safe_browsing/certificate_reporting_service.h
+++ b/chrome/browser/safe_browsing/certificate_reporting_service.h
@@ -55,6 +55,26 @@ class SafeBrowsingService;
 // extended reporting preferences.
 class CertificateReportingService : public KeyedService {
  public:
+  // Events for UMA. Do not rename or remove values, add new values to the end.
+  // Public for testing.
+  enum ReportOutcome {
+    // A report is submitted. This includes failed and successful uploads as
+    // well as uploads that never return a response.
+    REPORT_SUBMITTED = 0,
+    // A report submission failed, either because of a net error or a non-HTTP
+    // 200 response from the server.
+    REPORT_FAILED = 1,
+    // A report submission was successfully sent, receiving an HTTP 200 response
+    // from the server.
+    REPORT_SUCCESSFUL = 2,
+    // A report was dropped from the reporting queue because it was older
+    // than report TTL, or it was ignored because the queue was full and the
+    // report was older than the oldest report in the queue. Does not include
+    // reports that were cleared because of a SafeBrowsing preference change.
+    REPORT_DROPPED_OR_IGNORED = 3,
+    REPORT_EVENT_COUNT = 4
+  };
+
   // Represents a report to be sent.
   struct Report {
     int report_id;
@@ -153,6 +173,9 @@ class CertificateReportingService : public KeyedService {
     DISALLOW_COPY_AND_ASSIGN(Reporter);
   };
 
+  // Public for testing.
+  static const char kReportEventHistogram[];
+
   CertificateReportingService(
       safe_browsing::SafeBrowsingService* safe_browsing_service,
       scoped_refptr<net::URLRequestContextGetter> url_request_context_getter,