Add CefWaitableEvent interface for unit tests (issue #1632)

libcef/common/waitable_event_impl.h

@@ -0,0 +1,31 @@
+// Copyright 2016 The Chromium Embedded Framework 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  CEF_LIBCEF_COMMON_WAITABLE_EVENT_IMPL_H_
+#define  CEF_LIBCEF_COMMON_WAITABLE_EVENT_IMPL_H_
+#pragma once
+
+#include "include/cef_waitable_event.h"
+#include "base/synchronization/waitable_event.h"
+
+class CefWaitableEventImpl : public CefWaitableEvent {
+ public:
+  CefWaitableEventImpl(bool automatic_reset,
+                       bool initially_signaled);
+
+  // CefWaitableEvent methods:
+  void Reset() override;
+  void Signal() override;
+  bool IsSignaled() override;
+  void Wait() override;
+  bool TimedWait(int64 max_ms) override;
+
+ private:
+  base::WaitableEvent event_;
+
+  IMPLEMENT_REFCOUNTING(CefWaitableEventImpl);
+  DISALLOW_COPY_AND_ASSIGN(CefWaitableEventImpl);
+};
+
+#endif  // CEF_LIBCEF_COMMON_WAITABLE_EVENT_IMPL_H_