Add options for audio/video autoplay to chrome://settings/content.

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 c1472ef6326c1de774ce5b1a7477b5b4e5dea705..e00b885b41a27a1bb88420be0232933f1b6277f5 100644
--- a/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
@@ -356,6 +356,8 @@ HTMLMediaElement::HTMLMediaElement(const QualifiedName& tagName, Document& docum
 
     if (document.settings() && document.settings()->mediaPlaybackRequiresUserGesture())

[philipj_slow, 2015/10/28 10:19:35]

This is the "existing setting" I was referring to.

[DaleCurtis, 2015/10/30 19:25:56]

Ah gotcha, yeah this should be removable once we have the content setting.

[philipj_slow, 2015/11/02 13:15:45]

If it isn't too much trouble, could you do it in the same CL or at least have
the follow-up ready for review? Otherwise it's harder to be confident that the
content setting is a full replacement.

         m_userGestureRequiredForPlay = true;
+    if (!document.frame()->loader().allowMediaAutoplay(false))

[philipj_slow, 2015/10/23 09:06:14]

Can document().frame() be null? It's usually null checked in this file.

+        m_userGestureRequiredForPlay = true;
 
     setHasCustomStyleCallbacks();
     addElementToDocumentMap(this, &document);