Integrate fallback crash handling in chrome

components/crash/content/app/fallback_crash_handling_win.h

Index: components/crash/content/app/fallback_crash_handling_win.h
diff --git a/components/crash/content/app/fallback_crash_handling_win.h b/components/crash/content/app/fallback_crash_handling_win.h
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+++ b/components/crash/content/app/fallback_crash_handling_win.h
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+// Copyright 2017 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 COMPONENTS_CRASH_CONTENT_APP_FALLBACK_CRASH_HANDLING_WIN_H_
+#define COMPONENTS_CRASH_CONTENT_APP_FALLBACK_CRASH_HANDLING_WIN_H_
+
+#include <stdint.h>
+#include <string>
+
+#include "base/command_line.h"
+
+namespace crash_reporter {
+
+namespace switches {
+extern const char kFallbackCrashHandler[];
+// The fallback handler uses the same prefetch ID as the Crashpad handler.
+extern const char kPrefetchArgument[];
+}
+
+// A somewhat unique exit code for the crashed process. This is mostly
+// for testing, as there won't likely be anyone around to record the exit
+// code of the Crashpad handler.
+extern const uint32_t kFallbackCrashTerminationCode;
+
+// Sets up fallback crash handling for this process.
+// Note that this installs an unhandled exception filter, and requires
+// that the executable call the "RunAsFallbackCrashHandler" function, when
+// it's passed a --type switch with the value |kFallbackCrashHandlerType|.
+bool SetupFallbackCrashHandling(const base::CommandLine& command_line);
+
+// Runs the fallback crash handler process, to handle a crash in a process
+// that's previously called SetupFallbackCrashHandling.
+// The |product_name|, |version| and |channel_name| parameters will be used
+// as properties of the crash for the purposes of upload.
+int RunAsFallbackCrashHandler(const base::CommandLine& command_line,
+                              std::string product_name,
+                              std::string version,
+                              std::string channel_name);
+
+}  // namespace crash_reporter
+
+#endif  // COMPONENTS_CRASH_CONTENT_APP_FALLBACK_CRASH_HANDLING_WIN_H_