Don't show media controls when there is a persistent video.

third_party/WebKit/Source/core/html/shadow/MediaControls.cpp

Index: third_party/WebKit/Source/core/html/shadow/MediaControls.cpp
diff --git a/third_party/WebKit/Source/core/html/shadow/MediaControls.cpp b/third_party/WebKit/Source/core/html/shadow/MediaControls.cpp
index ad9607accff4eecd9e1c52ca347c46f62c5da3fd..cefa6bbe58aaa2700d79db8002164b7c78d8f0cf 100644
--- a/third_party/WebKit/Source/core/html/shadow/MediaControls.cpp
+++ b/third_party/WebKit/Source/core/html/shadow/MediaControls.cpp
@@ -71,8 +71,16 @@ static bool shouldShowFullscreenButton(const HTMLMediaElement& mediaElement) {
 }
 
 static bool shouldShowCastButton(HTMLMediaElement& mediaElement) {
-  return !mediaElement.fastHasAttribute(HTMLNames::disableremoteplaybackAttr) &&
-         mediaElement.hasRemoteRoutes();
+  if (mediaElement.fastHasAttribute(HTMLNames::disableremoteplaybackAttr))
+    return false;
+
+  // Explicitly do not show cast button when the mediaControlsEnabled setting is
+  // false to make sure the overlay does not appear.
+  Document& document = mediaElement.document();
+  if (document.settings() && !document.settings()->getMediaControlsEnabled())
+    return false;
+
+  return mediaElement.hasRemoteRoutes();
 }
 
 static bool preferHiddenVolumeControls(const Document& document) {