Only show overlay play button when controls are enabled.

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 185 matching lines @@
 void MediaControls::mediaElementFocused()
 {
     show();
     stopHideMediaControlsTimer();
 }
 
 void MediaControls::hide()
 {
     m_panel->setIsDisplayed(false);
     m_panel->hide();
+    if (m_overlayPlayButton)
+        m_overlayPlayButton->hide();

[acolwell GONE FROM CHROMIUM, 2014/07/01 17:06:22]

It seems like there should coorresponding "show" logic in MediaControls::show()
as well. Otherwise it seems like a "hide() then show()" sequence could cause the
controls to disappear and then never come back.

Perhaps the following in show() would work?
if (m_overlayPlayButton)
    m_overlayPlayButton->updateDisplayType();

 }
 
 void MediaControls::makeOpaque()
 {
     m_panel->makeOpaque();
 }
 
 void MediaControls::makeTransparent()
 {
     m_panel->makeTransparent();
@@ skipping 256 matching lines @@
     visitor->trace(m_muteButton);
     visitor->trace(m_volumeSlider);
     visitor->trace(m_toggleClosedCaptionsButton);
     visitor->trace(m_fullScreenButton);
     visitor->trace(m_durationDisplay);
     visitor->trace(m_enclosure);
     HTMLDivElement::trace(visitor);
 }
 
 }