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 8beea08cbcdda8e7b55f8d57890f68315abf9bed..55a5e6dfaeb74673babd005f4899a266a2092ea0 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;
@@ -3840,6 +3842,15 @@ 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()) {