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

third_party/WebKit/Source/core/html/HTMLMediaElement.cpp

Index: third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
diff --git a/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp b/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
index 9156bba583b6c602b3a8cc84b4db479d0b50a85d..902affb71737a2f9f111e65cfe73cdca8c78eda1 100644
--- a/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
@@ -134,6 +134,7 @@ enum MediaControlsShow {
   MediaControlsShowFullscreen,
   MediaControlsShowNoScript,
   MediaControlsShowNotShown,
+  MediaControlsShowDisabledSettings,
   MediaControlsShowMax
 };
 
@@ -357,6 +358,16 @@ bool HTMLMediaElement::mediaTracksEnabledInternally() {
          RuntimeEnabledFeatures::backgroundVideoTrackOptimizationEnabled();
 }
 
+void HTMLMediaElement::onMediaControlsEnabledChange(Document* document) {
+  auto it = documentToElementSetMap().find(document);
+  if (it == documentToElementSetMap().end())
+    return;
+  DCHECK(it->value);
+  WeakMediaElementSet& elements = *it->value;
+  for (const auto& element : elements)
+    element->updateControlsVisibility();
+}
+
 HTMLMediaElement::HTMLMediaElement(const QualifiedName& tagName,
                                    Document& document)
     : HTMLElement(tagName, document),
@@ -2361,6 +2372,13 @@ void HTMLMediaElement::setLoop(bool b) {
 
 bool HTMLMediaElement::shouldShowControls(
     const RecordMetricsBehavior recordMetrics) const {
+  Settings* settings = document().settings();
+  if (settings && !settings->getMediaControlsEnabled()) {
+    if (recordMetrics == RecordMetricsBehavior::DoRecord)
+      showControlsHistogram().count(MediaControlsShowDisabledSettings);
+    return false;
+  }
+
   if (fastHasAttribute(controlsAttr)) {
     if (recordMetrics == RecordMetricsBehavior::DoRecord)
       showControlsHistogram().count(MediaControlsShowAttribute);