Make Crashpad start asynchronous, and move back to chrome_elf

components/crash/content/app/crashpad.cc

 // 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 <stddef.h>
 #include <string.h>
 
 #include <algorithm>
@@ skipping 317 matching lines @@
 void __declspec(dllexport) __cdecl ClearCrashKeyValueImpl(const wchar_t* key) {
   crash_reporter::ClearCrashKey(base::UTF16ToUTF8(key));
 }
 
 // This helper is invoked by code in chrome.dll to request a single crash report
 // upload. See CrashUploadListCrashpad.
 void __declspec(dllexport)
     RequestSingleCrashUploadImpl(const std::string& local_id) {
   crash_reporter::RequestSingleCrashUpload(local_id);
 }
+
+// This helper is invoked by code in chrome.dll to wait for the handler start to
+// complete.
+void __declspec(dllexport) BlockUntilHandlerStartedImpl() {
+  crash_reporter::BlockUntilHandlerStarted();
+}
+
 }  // extern "C"
 
 #endif  // OS_WIN