Update code to current Chromium master

This corresponds to:

Chromium: 6555f9456074c0c0e5f7713564b978588ac04a5d
webrtc: c8b569e0a7ad0b369e15f0197b3a558699ec8efa

webrtc/system_wrappers/include/event_wrapper.h

@@ -0,0 +1,70 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_SYSTEM_WRAPPERS_INCLUDE_EVENT_WRAPPER_H_
+#define WEBRTC_SYSTEM_WRAPPERS_INCLUDE_EVENT_WRAPPER_H_
+
+namespace webrtc {
+enum EventTypeWrapper {
+  kEventSignaled = 1,
+  kEventError = 2,
+  kEventTimeout = 3
+};
+
+#define WEBRTC_EVENT_INFINITE 0xffffffff
+
+class EventTimerWrapper;
+
+class EventWrapper {
+ public:
+  // Factory method. Constructor disabled.
+  static EventWrapper* Create();
+
+  virtual ~EventWrapper() {}
+
+  // Releases threads who are calling Wait() and has started waiting. Please
+  // note that a thread calling Wait() will not start waiting immediately.
+  // assumptions to the contrary is a very common source of issues in
+  // multithreaded programming.
+  // Set is sticky in the sense that it will release at least one thread
+  // either immediately or some time in the future.
+  virtual bool Set() = 0;
+
+  // Puts the calling thread into a wait state. The thread may be released
+  // by a Set() call depending on if other threads are waiting and if so on
+  // timing. The thread that was released will reset the event before leaving
+  // preventing more threads from being released. If multiple threads
+  // are waiting for the same Set(), only one (random) thread is guaranteed to
+  // be released. It is possible that multiple (random) threads are released
+  // Depending on timing.
+  //
+  // |max_time| is the maximum time to wait in milliseconds or
+  // WEBRTC_EVENT_INFINITE to wait infinitely.
+  virtual EventTypeWrapper Wait(unsigned long max_time) = 0;
+};
+
+class EventTimerWrapper : public EventWrapper {
+ public:
+  static EventTimerWrapper* Create();
+
+  // Starts a timer that will call a non-sticky version of Set() either once
+  // or periodically. If the timer is periodic it ensures that there is no
+  // drift over time relative to the system clock.
+  //
+  // |time| is in milliseconds.
+  virtual bool StartTimer(bool periodic, unsigned long time) = 0;
+
+  virtual bool StopTimer() = 0;
+
+};
+
+}  // namespace webrtc
+
+#endif  // WEBRTC_SYSTEM_WRAPPERS_INCLUDE_EVENT_WRAPPER_H_