Linux: Implement RecordBreakpadStatusUMA.

chrome/app/breakpad_linux.h

 // Copyright (c) 2009 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_APP_BREAKPAD_LINUX_H_
 #define CHROME_APP_BREAKPAD_LINUX_H_
 
 #include <stdlib.h>
 
 extern void InitCrashReporter();
+bool IsCrashReporterEnabled();
 
 static const size_t kMaxActiveURLSize = 1024;
 static const size_t kGuidSize = 32;  // 128 bits = 32 chars in hex.
 static const size_t kDistroSize = 128;
 
 struct BreakpadInfo {
   const char* filename;
   const char* process_type;
   unsigned process_type_length;
   const char* crash_url;
   unsigned crash_url_length;
   const char* guid;
   unsigned guid_length;
   const char* distro;
   unsigned distro_length;
   const char* plugin_list;
   unsigned plugin_list_length;
   bool upload;
 };
 
 extern int HandleCrashDump(const BreakpadInfo& info);
 
 #endif  // CHROME_APP_BREAKPAD_LINUX_H_