diff -r 000000000000 -r 6474c204b198 security/sandbox/chromium/base/threading/platform_thread.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/security/sandbox/chromium/base/threading/platform_thread.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,160 @@
+// Copyright (c) 2012 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.
+
+// WARNING: You should *NOT* be using this class directly.  PlatformThread is
+// the low-level platform-specific abstraction to the OS's threading interface.
+// You should instead be using a message-loop driven Thread, see thread.h.
+
+#ifndef BASE_THREADING_PLATFORM_THREAD_H_
+#define BASE_THREADING_PLATFORM_THREAD_H_
+
+#include "base/base_export.h"
+#include "base/basictypes.h"
+#include "base/time/time.h"
+#include "build/build_config.h"
+
+#if defined(OS_WIN)
+#include <windows.h>
+#elif defined(OS_POSIX)
+#include <pthread.h>
+#include <unistd.h>
+#endif
+
+namespace base {
+
+#if defined(OS_WIN)
+typedef DWORD PlatformThreadId;
+#elif defined(OS_POSIX)
+typedef pid_t PlatformThreadId;
+#endif
+
+class PlatformThreadHandle {
+ public:
+#if defined(OS_WIN)
+  typedef void* Handle;
+#elif defined(OS_POSIX)
+  typedef pthread_t Handle;
+#endif
+
+  PlatformThreadHandle()
+      : handle_(0),
+        id_(0) {
+  }
+
+  explicit PlatformThreadHandle(Handle handle)
+      : handle_(handle),
+        id_(0) {
+  }
+
+  PlatformThreadHandle(Handle handle,
+                       PlatformThreadId id)
+      : handle_(handle),
+        id_(id) {
+  }
+
+  bool is_equal(const PlatformThreadHandle& other) {
+    return handle_ == other.handle_;
+  }
+
+  bool is_null() {
+    return !handle_;
+  }
+
+  Handle platform_handle() {
+    return handle_;
+  }
+
+ private:
+  friend class PlatformThread;
+
+  Handle handle_;
+  PlatformThreadId id_;
+};
+
+const PlatformThreadId kInvalidThreadId(0);
+
+// Valid values for SetThreadPriority()
+enum ThreadPriority{
+  kThreadPriority_Normal,
+  // Suitable for low-latency, glitch-resistant audio.
+  kThreadPriority_RealtimeAudio,
+  // Suitable for threads which generate data for the display (at ~60Hz).
+  kThreadPriority_Display,
+  // Suitable for threads that shouldn't disrupt high priority work.
+  kThreadPriority_Background
+};
+
+// A namespace for low-level thread functions.
+class BASE_EXPORT PlatformThread {
+ public:
+  // Implement this interface to run code on a background thread.  Your
+  // ThreadMain method will be called on the newly created thread.
+  class BASE_EXPORT Delegate {
+   public:
+    virtual void ThreadMain() = 0;
+
+   protected:
+    virtual ~Delegate() {}
+  };
+
+  // Gets the current thread id, which may be useful for logging purposes.
+  static PlatformThreadId CurrentId();
+
+  // Get the current handle.
+  static PlatformThreadHandle CurrentHandle();
+
+  // Yield the current thread so another thread can be scheduled.
+  static void YieldCurrentThread();
+
+  // Sleeps for the specified duration.
+  static void Sleep(base::TimeDelta duration);
+
+  // Sets the thread name visible to debuggers/tools. This has no effect
+  // otherwise. This name pointer is not copied internally. Thus, it must stay
+  // valid until the thread ends.
+  static void SetName(const char* name);
+
+  // Gets the thread name, if previously set by SetName.
+  static const char* GetName();
+
+  // Creates a new thread.  The |stack_size| parameter can be 0 to indicate
+  // that the default stack size should be used.  Upon success,
+  // |*thread_handle| will be assigned a handle to the newly created thread,
+  // and |delegate|'s ThreadMain method will be executed on the newly created
+  // thread.
+  // NOTE: When you are done with the thread handle, you must call Join to
+  // release system resources associated with the thread.  You must ensure that
+  // the Delegate object outlives the thread.
+  static bool Create(size_t stack_size, Delegate* delegate,
+                     PlatformThreadHandle* thread_handle);
+
+  // CreateWithPriority() does the same thing as Create() except the priority of
+  // the thread is set based on |priority|.  Can be used in place of Create()
+  // followed by SetThreadPriority().  SetThreadPriority() has not been
+  // implemented on the Linux platform yet, this is the only way to get a high
+  // priority thread on Linux.
+  static bool CreateWithPriority(size_t stack_size, Delegate* delegate,
+                                 PlatformThreadHandle* thread_handle,
+                                 ThreadPriority priority);
+
+  // CreateNonJoinable() does the same thing as Create() except the thread
+  // cannot be Join()'d.  Therefore, it also does not output a
+  // PlatformThreadHandle.
+  static bool CreateNonJoinable(size_t stack_size, Delegate* delegate);
+
+  // Joins with a thread created via the Create function.  This function blocks
+  // the caller until the designated thread exits.  This will invalidate
+  // |thread_handle|.
+  static void Join(PlatformThreadHandle thread_handle);
+
+  static void SetThreadPriority(PlatformThreadHandle handle,
+                                ThreadPriority priority);
+
+ private:
+  DISALLOW_IMPLICIT_CONSTRUCTORS(PlatformThread);
+};
+
+}  // namespace base
+
+#endif  // BASE_THREADING_PLATFORM_THREAD_H_