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

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

Index: third_party/WebKit/Source/core/html/shadow/MediaControlsTest.cpp
diff --git a/third_party/WebKit/Source/core/html/shadow/MediaControlsTest.cpp b/third_party/WebKit/Source/core/html/shadow/MediaControlsTest.cpp
index 685b14cd1c28754d9f67aa512892e13a2b30ff86..7084123c49efc92006176de56571a9f30e50ece6 100644
--- a/third_party/WebKit/Source/core/html/shadow/MediaControlsTest.cpp
+++ b/third_party/WebKit/Source/core/html/shadow/MediaControlsTest.cpp
@@ -293,6 +293,22 @@ TEST_F(MediaControlsTest, CastOverlayDisableRemotePlaybackAttr) {
   ASSERT_TRUE(isElementVisible(*castOverlayButton));
 }
 
+TEST_F(MediaControlsTest, CastOverlayMediaControlsDisabled) {
+  Element* castOverlayButton = getElementByShadowPseudoId(
+      mediaControls(), "-internal-media-controls-overlay-cast-button");
+  ASSERT_NE(nullptr, castOverlayButton);
+
+  EXPECT_FALSE(isElementVisible(*castOverlayButton));
+  simulateRouteAvailabe();
+  EXPECT_TRUE(isElementVisible(*castOverlayButton));
+
+  document().settings()->setMediaControlsEnabled(false);
+  EXPECT_FALSE(isElementVisible(*castOverlayButton));
+
+  document().settings()->setMediaControlsEnabled(true);
+  EXPECT_TRUE(isElementVisible(*castOverlayButton));
+}
+
 TEST_F(MediaControlsTest, KeepControlsVisibleIfOverflowListVisible) {
   Element* overflowList = getElementByShadowPseudoId(
       mediaControls(), "-internal-media-controls-overflow-menu-list");