Start separating the text track container from the media controls

Source/core/html/track/TextTrackContainer.h

 /*
+ * Copyright (C) 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2012 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  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.
  * 3.  Neither the name of Apple Computer, Inc. ("Apple") 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 APPLE AND ITS 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 APPLE OR ITS 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 AudioIOCallback_h
-#define AudioIOCallback_h
+#ifndef TextTrackContainer_h
+#define TextTrackContainer_h
+
+#include "core/html/HTMLDivElement.h"
 
 namespace blink {
 
-class AudioBus;
+class HTMLMediaElement;
 
-// Abstract base-class for isochronous audio I/O client.
-class AudioIOCallback {
+class TextTrackContainer final : public HTMLDivElement {
 public:
-    // render() is called periodically to get the next render quantum of audio into destinationBus.
-    // Optional audio input is given in sourceBus (if it's not 0).
-    virtual void render(AudioBus* sourceBus, AudioBus* destinationBus, size_t framesToProcess) = 0;
+    static PassRefPtrWillBeRawPtr<TextTrackContainer> create(Document&);
 
-    virtual ~AudioIOCallback() { }
+    void updateDisplay(HTMLMediaElement&);
+    void updateSizes(LayoutObject*);
+
+private:
+    TextTrackContainer(Document&);
+
+    virtual bool isTextTrackContainer() const override { return true; }
+
+    virtual LayoutObject* createLayoutObject(const LayoutStyle&) override;
+
+    IntSize m_videoSize;
+    float m_fontSize;
 };
 
+DEFINE_ELEMENT_TYPE_CASTS(TextTrackContainer, isTextTrackContainer());
+
 } // namespace blink
 
-#endif // AudioIOCallback_h
+#endif // TextTrackContainer_h