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diff --git a/chromium/third_party/blink/renderer/platform/waitable_event.h b/chromium/third_party/blink/renderer/platform/waitable_event.h
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+/*
+ * Copyright (C) 2014 Google Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_WAITABLE_EVENT_H_
+#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_WAITABLE_EVENT_H_
+
+#include <memory>
+#include "third_party/blink/renderer/platform/platform_export.h"
+#include "third_party/blink/renderer/platform/wtf/vector.h"
+
+namespace base {
+class WaitableEvent;
+};  // namespace base
+
+namespace blink {
+
+// TODO(crbug.com/796799): Deprecate blink::WaitableEvent and use
+// base::WaitableEvent instead.
+//
+// Provides a thread synchronization that can be used to allow one thread to
+// wait until another thread to finish some work.
+class PLATFORM_EXPORT WaitableEvent {
+ public:
+  // If ResetPolicy::Manual is specified on creation, to set the event state
+  // to non-signaled, a consumer must call reset().  Otherwise, the system
+  // automatically resets the event state to non-signaled after a single
+  // waiting thread has been released.
+  enum class ResetPolicy { kAuto, kManual };
+
+  // Specify the initial state on creation.
+  enum class InitialState { kNonSignaled, kSignaled };
+
+  explicit WaitableEvent(ResetPolicy = ResetPolicy::kAuto,
+                         InitialState = InitialState::kNonSignaled);
+
+  ~WaitableEvent();
+
+  // Puts the event in the un-signaled state.
+  void Reset();
+
+  // Waits indefinitely for the event to be signaled.
+  void Wait();
+
+  // Puts the event in the signaled state. Causing any thread blocked on Wait
+  // to be woken up. The event state is reset to non-signaled after
+  // a waiting thread has been released.
+  void Signal();
+
+  // Waits on multiple events and returns the index of the object that
+  // has been signaled. Any event objects given to this method must
+  // not deleted while this wait is happening.
+  static size_t WaitMultiple(const WTF::Vector<WaitableEvent*>& events);
+
+ private:
+  WaitableEvent(const WaitableEvent&) = delete;
+  void operator=(const WaitableEvent&) = delete;
+
+  std::unique_ptr<base::WaitableEvent> impl_;
+};
+
+}  // namespace blink
+
+#endif  // THIRD_PARTY_BLINK_RENDERER_PLATFORM_WAITABLE_EVENT_H_