Add -ifsameorigin to autoplay experiment.

third_party/WebKit/Source/core/frame/UseCounter.cpp

 /*
  * Copyright (C) 2012 Google, Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 722 matching lines @@
 void UseCounter::countIfNotPrivateScript(v8::Isolate* isolate, const ExecutionContext* context, Feature feature)
 {
     if (DOMWrapperWorld::current(isolate).isPrivateScriptIsolatedWorld())
         return;
     UseCounter::count(context, feature);
 }
 
 void UseCounter::countCrossOriginIframe(const Document& document, Feature feature)
 {
     Frame* frame = document.frame();
-    if (!frame)
-        return;
-    // Check to see if the frame can script into the top level document.
-    SecurityOrigin* securityOrigin = frame->securityContext()->getSecurityOrigin();
-    Frame* top = frame->tree().top();
-    if (top && !securityOrigin->canAccess(top->securityContext()->getSecurityOrigin()))
+    if (frame && frame->isCrossOrigin())
         count(frame, feature);
 }
 
 void UseCounter::count(CSSParserMode cssParserMode, CSSPropertyID feature)
 {
     ASSERT(feature >= firstCSSProperty);
     ASSERT(feature <= lastUnresolvedCSSProperty);
 
     if (!isUseCounterEnabledForMode(cssParserMode))
         return;
@@ skipping 24 matching lines @@
 UseCounter* UseCounter::getFrom(const StyleSheetContents* sheetContents)
 {
     // FIXME: We may want to handle stylesheets that have multiple owners
     //        https://crbug.com/242125
     if (sheetContents && sheetContents->hasSingleOwnerNode())
         return getFrom(sheetContents->singleOwnerDocument());
     return 0;
 }
 
 } // namespace blink