Media Controls: move all MediaControlDivElement sub-classes to modules/.

third_party/WebKit/Source/modules/media_controls/elements/MediaControlPanelElement.h

+// Copyright 2017 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 MediaControlPanelElement_h
+#define MediaControlPanelElement_h
+
+#include "core/html/shadow/MediaControlElementTypes.h"
+#include "platform/Timer.h"
+
+namespace blink {
+
+class Event;
+class MediaControlsImpl;
+class TimerBase;
+
+class MediaControlPanelElement final : public MediaControlDivElement {
+ public:
+  explicit MediaControlPanelElement(MediaControlsImpl&);
+
+ public:
+  // Methods called by `MediaContrlsImpl`.
+  void SetIsDisplayed(bool);
+  bool IsOpaque() const;
+  void MakeOpaque();
+  void MakeTransparent();
+
+ private:
+  void DefaultEventHandler(Event*) override;
+  bool KeepEventInNode(Event*) override;
+
+  void StartTimer();
+  void StopTimer();
+  void TransitionTimerFired(TimerBase*);
+  void DidBecomeVisible();
+
+  bool is_displayed_ = false;
+  bool opaque_ = true;
+
+  TaskRunnerTimer<MediaControlPanelElement> transition_timer_;
+};
+
+}  // namespace blink
+
+#endif  // MediaControlPanelElement_h