Remove media controls when not in use.

Source/core/html/shadow/MediaControlElements.cpp

Index: Source/core/html/shadow/MediaControlElements.cpp
diff --git a/Source/core/html/shadow/MediaControlElements.cpp b/Source/core/html/shadow/MediaControlElements.cpp
index 4e7b8f2d3b382ccc72c426efef00ad3fe5752557..a7e97b7450adb95ad0f71a1c99c95c4aa12e53aa 100644
--- a/Source/core/html/shadow/MediaControlElements.cpp
+++ b/Source/core/html/shadow/MediaControlElements.cpp
@@ -357,6 +357,7 @@ const AtomicString& MediaControlPlayButtonElement::shadowPseudoId() const
 
 MediaControlOverlayPlayButtonElement::MediaControlOverlayPlayButtonElement(Document& document)
     : MediaControlInputElement(document, MediaOverlayPlayButton)
+    , m_visible(false)
 {
 }
 
@@ -380,12 +381,17 @@ void MediaControlOverlayPlayButtonElement::defaultEventHandler(Event* event)
 
 void MediaControlOverlayPlayButtonElement::updateDisplayType()
 {
-    if (mediaController()->canPlay()) {
+    if (m_visible && mediaController()->canPlay()) {
         show();
     } else
         hide();
 }
 
+void MediaControlOverlayPlayButtonElement::setVisible(bool visible)
+{
+    m_visible = visible;
+}
+
 const AtomicString& MediaControlOverlayPlayButtonElement::shadowPseudoId() const
 {
     DEFINE_STATIC_LOCAL(AtomicString, id, ("-webkit-media-controls-overlay-play-button", AtomicString::ConstructFromLiteral));