crash-reporter: Add diagnostics to help diagnose failures in the wild

system_logging_mock.cc

 // Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <stdarg.h>
 
 #include "base/string_util.h"
 #include "crash-reporter/system_logging_mock.h"
 
 void SystemLoggingMock::LogInfo(const char *format, ...) {
@@ skipping 15 matching lines @@
 }
 
 void SystemLoggingMock::LogError(const char *format, ...) {
   va_list vl;
   va_start(vl, format);
   log_ += ident_ + "error: ";
   StringAppendV(&log_, format, vl);
   log_ += "\n";
   va_end(vl);
 }
+
+void SystemLoggingMock::set_accumulator(std::string *accumulator) {
+}