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diff --git a/security/sandbox/chromium/base/debug/debugger.h b/security/sandbox/chromium/base/debug/debugger.h
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+++ b/security/sandbox/chromium/base/debug/debugger.h
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+// Copyright (c) 2011 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.
+
+// This is a cross platform interface for helper functions related to
+// debuggers.  You should use this to test if you're running under a debugger,
+// and if you would like to yield (breakpoint) into the debugger.
+
+#ifndef BASE_DEBUG_DEBUGGER_H_
+#define BASE_DEBUG_DEBUGGER_H_
+
+#include "base/base_export.h"
+
+namespace base {
+namespace debug {
+
+// Waits wait_seconds seconds for a debugger to attach to the current process.
+// When silent is false, an exception is thrown when a debugger is detected.
+BASE_EXPORT bool WaitForDebugger(int wait_seconds, bool silent);
+
+// Returns true if the given process is being run under a debugger.
+//
+// On OS X, the underlying mechanism doesn't work when the sandbox is enabled.
+// To get around this, this function caches its value.
+//
+// WARNING: Because of this, on OS X, a call MUST be made to this function
+// BEFORE the sandbox is enabled.
+BASE_EXPORT bool BeingDebugged();
+
+// Break into the debugger, assumes a debugger is present.
+BASE_EXPORT void BreakDebugger();
+
+// Used in test code, this controls whether showing dialogs and breaking into
+// the debugger is suppressed for debug errors, even in debug mode (normally
+// release mode doesn't do this stuff --  this is controlled separately).
+// Normally UI is not suppressed.  This is normally used when running automated
+// tests where we want a crash rather than a dialog or a debugger.
+BASE_EXPORT void SetSuppressDebugUI(bool suppress);
+BASE_EXPORT bool IsDebugUISuppressed();
+
+// If a debugger is present, verifies that it is properly set up, and DCHECK()s
+// if misconfigured.  Currently only verifies that //tools/gdb/gdbinit has been
+// sourced when using gdb on Linux and //tools/lldb/lldbinit.py has been sourced
+// when using lldb on macOS.
+BASE_EXPORT void VerifyDebugger();
+
+}  // namespace debug
+}  // namespace base
+
+#endif  // BASE_DEBUG_DEBUGGER_H_