Add support for the ExperimentalSwReporterEngine field trial.

chrome/browser/safe_browsing/srt_field_trial_win.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_SAFE_BROWSING_SRT_FIELD_TRIAL_WIN_H_
 #define CHROME_BROWSER_SAFE_BROWSING_SRT_FIELD_TRIAL_WIN_H_
 
 #include <string>
 
 namespace safe_browsing {
@@ skipping 13 matching lines @@
 };
 enum SwReporterUmaValue {
   // Deprecated.
   SW_REPORTER_EXPLICIT_REQUEST = 0,
   // Deprecated.
   SW_REPORTER_STARTUP_RETRY = 1,
   // Deprecated.
   SW_REPORTER_RETRIED_TOO_MANY_TIMES = 2,
   SW_REPORTER_START_EXECUTION = 3,
   SW_REPORTER_FAILED_TO_START = 4,
+  // Deprecated.
   SW_REPORTER_REGISTRY_EXIT_CODE = 5,
   // Deprecated.
   SW_REPORTER_RESET_RETRIES = 6,
   SW_REPORTER_DOWNLOAD_START = 7,
   SW_REPORTER_NO_BROWSER = 8,
   SW_REPORTER_NO_LOCAL_STATE = 9,
   SW_REPORTER_NO_PROMPT_NEEDED = 10,
   SW_REPORTER_NO_PROMPT_FIELD_TRIAL = 11,
   SW_REPORTER_ALREADY_PROMPTED = 12,
   SW_REPORTER_RAN_DAILY = 13,
@@ skipping 17 matching lines @@
 // Returns the correct SRT download URL for the current field trial.
 const char* GetSRTDownloadURL();
 
 // Returns the value of the incoming SRT seed.
 std::string GetIncomingSRTSeed();
 
 // Records a value for the SRT Prompt Histogram.
 void RecordSRTPromptHistogram(SRTPromptHistogramValue value);
 
 // Records a value for the reporter step Histogram.
-void RecordReporterStepHistogram(SwReporterUmaValue value);
+void RecordReporterStepHistogram(SwReporterUmaValue value,
+    const std::string& suffix = std::string());
 
 }  // namespace safe_browsing
 
 #endif  // CHROME_BROWSER_SAFE_BROWSING_SRT_FIELD_TRIAL_WIN_H_