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diff --git a/chromium/third_party/blink/renderer/core/html/media/remote_playback_observer.h b/chromium/third_party/blink/renderer/core/html/media/remote_playback_observer.h
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index 00000000000..e9e7cc85371
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+++ b/chromium/third_party/blink/renderer/core/html/media/remote_playback_observer.h
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+// Copyright 2018 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.
+
+#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_HTML_MEDIA_REMOTE_PLAYBACK_OBSERVER_H_
+#define THIRD_PARTY_BLINK_RENDERER_CORE_HTML_MEDIA_REMOTE_PLAYBACK_OBSERVER_H_
+
+namespace blink {
+
+enum class WebRemotePlaybackAvailability;
+enum class WebRemotePlaybackState;
+
+// Interface to be implemented by objects that intend to be notified by remote
+// playback status changes on an HTMLMediaElement. The object should self-add
+// itself to the RemotePlaybackController using the add/remove observer methods.
+class RemotePlaybackObserver : public GarbageCollectedMixin {
+ public:
+  // Called when the remote playback state is changed. The state is related to
+  // the connection to a remote device.
+  virtual void OnRemotePlaybackStateChanged(WebRemotePlaybackState) = 0;
+
+  // Called when the remote playback availability is changed. The availabality
+  // is realted to the presence of a compatible remote device on the network.
+  virtual void OnRemotePlaybackAvailabilityChanged(
+      WebRemotePlaybackAvailability) = 0;
+};
+
+}  // namespace blink
+
+#endif  // THIRD_PARTY_BLINK_RENDERER_CORE_HTML_MEDIA_REMOTE_PLAYBACK_OBSERVER_H_