Moving src/webrtc into src/.

In order to eliminate the WebRTC Subtree mirror in Chromium, 
WebRTC is moving the content of the src/webrtc directory up
to the src/ directory.

NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
TBR=tommi@webrtc.org

Bug: chromium:611808
Change-Id: Iac59c5b51b950f174119565bac87955a7994bc38
Reviewed-on: https://webrtc-review.googlesource.com/1560
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Henrik Kjellander <kjellander@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#19845}

rtc_base/event.h

@@ -0,0 +1,54 @@
+/*
+ *  Copyright 2004 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_RTC_BASE_EVENT_H_
+#define WEBRTC_RTC_BASE_EVENT_H_
+
+#include "webrtc/rtc_base/constructormagic.h"
+#if defined(WEBRTC_WIN)
+#include "webrtc/rtc_base/win32.h"  // NOLINT: consider this a system header.
+#elif defined(WEBRTC_POSIX)
+#include <pthread.h>
+#else
+#error "Must define either WEBRTC_WIN or WEBRTC_POSIX."
+#endif
+
+namespace rtc {
+
+class Event {
+ public:
+  static const int kForever = -1;
+
+  Event(bool manual_reset, bool initially_signaled);
+  ~Event();
+
+  void Set();
+  void Reset();
+
+  // Wait for the event to become signaled, for the specified number of
+  // |milliseconds|.  To wait indefinetly, pass kForever.
+  bool Wait(int milliseconds);
+
+ private:
+#if defined(WEBRTC_WIN)
+  HANDLE event_handle_;
+#elif defined(WEBRTC_POSIX)
+  pthread_mutex_t event_mutex_;
+  pthread_cond_t event_cond_;
+  const bool is_manual_reset_;
+  bool event_status_;
+#endif
+
+  RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(Event);
+};
+
+}  // namespace rtc
+
+#endif  // WEBRTC_RTC_BASE_EVENT_H_