Implement <video controls> dodging for text track layout

Source/core/html/shadow/MediaControls.cpp

 /*
  * Copyright (C) 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2011, 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
@@ skipping 175 matching lines @@
 
     if (mediaElement().hasVideo() && fullscreenIsSupported(document()))
         m_fullScreenButton->show();
     else
         m_fullScreenButton->hide();
 
     refreshCastButtonVisibility();
     makeOpaque();
 }
 
+LayoutObject* MediaControls::layoutObjectForTextTrackLayout()
+{
+    return m_panel->layoutObject();
+}
+
 void MediaControls::show()
 {
     makeOpaque();
+    m_panel->show();
     m_panel->setIsDisplayed(true);
-    m_panel->show();
     if (m_overlayPlayButton)
         m_overlayPlayButton->updateDisplayType();
 }
 
 void MediaControls::mediaElementFocused()
 {
     if (mediaElement().shouldShowControls()) {
         show();
         resetHideMediaControlsTimer();
     }
 }
 
 void MediaControls::hide()
 {
+    m_panel->hide();
     m_panel->setIsDisplayed(false);
-    m_panel->hide();
     if (m_overlayPlayButton)
         m_overlayPlayButton->hide();
 }
 
 void MediaControls::makeOpaque()
 {
     m_panel->makeOpaque();
 }
 
 void MediaControls::makeTransparent()
@@ skipping 297 matching lines @@
     visitor->trace(m_toggleClosedCaptionsButton);
     visitor->trace(m_fullScreenButton);
     visitor->trace(m_durationDisplay);
     visitor->trace(m_enclosure);
     visitor->trace(m_castButton);
     visitor->trace(m_overlayCastButton);
     HTMLDivElement::trace(visitor);
 }
 
 }