Move TextTrackContainer::updateSizes to the layout-side

Source/core/layout/LayoutTextTrackContainer.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.
@@ skipping 11 matching lines @@
  * 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 LayoutTextTrackContainer_h
 #define LayoutTextTrackContainer_h
 
 #include "core/layout/LayoutBlockFlow.h"
+#include "platform/geometry/IntSize.h"
 
 namespace blink {
 
 class Element;
+class LayoutVideo;
 
 class LayoutTextTrackContainer final : public LayoutBlockFlow {
 public:
     LayoutTextTrackContainer(Element*);
 
 private:
     virtual void layout() override;
+
+    bool updateSizes(const LayoutVideo&);
+
+    IntSize m_videoSize;
+    float m_fontSize;
 };
 
 } // namespace blink
 
 #endif // LayoutTextTrackContainer_h