Disable autoplay experiments if the autoplay content settings is set to block.

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

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/html/AutoplayExperimentHelper.h"
 
 #include "core/dom/Document.h"
 #include "core/frame/Settings.h"
 #include "core/html/HTMLMediaElement.h"
 #include "core/layout/LayoutBox.h"
@@ skipping 283 matching lines @@
     client().playInternal();
 
     return true;
 }
 
 bool AutoplayExperimentHelper::isEligible() const
 {
     if (m_mode == Mode::ExperimentOff)
         return false;
 
+    // If autoplay is disabled, no one is eligible.
+    if (!client().isAutoplayAllowedPerSettings())
+        return false;
+
     // If no user gesture is required, then the experiment doesn't apply.
     // This is what prevents us from starting playback more than once.
     // Since this flag is never set to true once it's cleared, it will block
     // the autoplay experiment forever.
     if (!isUserGestureRequiredForPlay())
         return false;
 
     // Make sure that this is an element of the right type.
     if (!enabled(ForVideo) && client().isHTMLVideoElement())
         return false;
@@ skipping 176 matching lines @@
         ? AnyVideoElement
         : AnyAudioElement);
 }
 
 bool AutoplayExperimentHelper::requiresViewportVisibility() const
 {
     return enabled(IfViewport) || enabled(IfPartialViewport);
 }
 
 } // namespace blink