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

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 0957206f03f80460381ac266a4bf48e5aee94d3a..824261029aae313f61bea0a582eaa1f5fc9721ce 100644
--- a/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
@@ -324,6 +324,8 @@ public:
         return frame && frame->isCrossOrigin();
     }
 
+    bool isAutoplayAllowedPerSettings() const override;
+
     // LayoutObject
     void setRequestPositionUpdates(bool) override;
     IntRect absoluteBoundingBoxRect() const override;
@@ -3838,6 +3840,15 @@ String HTMLMediaElement::AutoplayHelperClientImpl::autoplayExperimentMode() cons
     return mode;
 }
 
+bool HTMLMediaElement::AutoplayHelperClientImpl::isAutoplayAllowedPerSettings() const
+{
+    LocalFrame* frame = m_element->document().frame();
+    if (!frame)
+        return false;
+    FrameLoaderClient* frameLoaderClient = frame->loader().client();
+    return frameLoaderClient && frameLoaderClient->allowAutoplay(false);
+}
+
 void HTMLMediaElement::AutoplayHelperClientImpl::setRequestPositionUpdates(bool request)
 {
     if (LayoutObject* layoutObject = m_element->layoutObject()) {