Monitor crashpad_handler for crashes [sometimes]

components/crash/content/app/crashpad_mac.mm

 // 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.
 
 #include "components/crash/content/app/crashpad.h"
 
 #include <CoreFoundation/CoreFoundation.h>
 #include <string.h>
 #include <unistd.h>
 
@@ skipping 63 matching lines @@
 #endif
 
       NSString* version =
           base::mac::ObjCCast<NSString>([base::mac::FrameworkBundle()
               objectForInfoDictionaryKey:@"CFBundleShortVersionString"]);
       process_annotations["ver"] = base::SysNSStringToUTF8(version);
 
       process_annotations["plat"] = std::string("OS X");
 
       std::vector<std::string> arguments;
+
+      if (crash_reporter_client->ShouldMonitorCrashHandlerExpensively()) {
+        arguments.push_back("--monitor-self");
+      }
+
+      // Set up --monitor-self-annotation even in the absence of --monitor-self
+      // so that minidumps produced by generate_dump will contain these
+      // annotations.
+      arguments.push_back("--monitor-self-annotation=ptype=crashpad-handler");
+
       if (!browser_process) {
         // If this is an initial client that's not the browser process, it's
         // important that the new Crashpad handler also not be connected to any
         // existing handler. This argument tells the new Crashpad handler to
         // sever this connection.
         arguments.push_back(
             "--reset-own-crash-exception-port-to-system-default");
       }
 
       bool result = GetCrashpadClient().StartHandler(
           handler_path, database_path, metrics_path, url, process_annotations,
           arguments, true, false);
 
       // If this is an initial client that's not the browser process, it's
       // important to sever the connection to any existing handler. If
       // StartHandler() failed, call UseSystemDefaultHandler() to drop the link
       // to the existing handler.
       if (!result && !browser_process) {
         crashpad::CrashpadClient::UseSystemDefaultHandler();
       }
     }  // @autoreleasepool
   }
 
   return database_path;
 }
 
 }  // namespace internal
 }  // namespace crash_reporter