Add -ifsameorigin to autoplay experiment.

third_party/WebKit/Source/core/frame/Frame.h

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999-2001 Lars Knoll <knoll@kde.org>
  *                     1999-2001 Antti Koivisto <koivisto@kde.org>
  *                     2000-2001 Simon Hausmann <hausmann@kde.org>
  *                     2000-2001 Dirk Mueller <mueller@kde.org>
  *                     2000 Stefan Schimanski <1Stein@gmx.de>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2008 Eric Seidel <eric@webkit.org>
@@ skipping 103 matching lines @@
     // otherwise.
     virtual bool prepareForCommit() = 0;
 
     bool canNavigate(const Frame&);
     virtual void printNavigationErrorMessage(const Frame&, const char* reason) = 0;
 
     LayoutPart* ownerLayoutObject() const; // LayoutObject for the element that contains this frame.
 
     Settings* settings() const; // can be null
 
+    // Return true if and only if this frame is a cross-origin frame.

[mlamouri (slow - plz ping), 2016/04/27 13:17:37]

I think the comment should say cross-origin to what? (here, the top frame)

[liberato (no reviews please), 2016/04/28 17:32:35]

Done.

+    bool isCrossOrigin() const;
+
     // isLoading() is true when the embedder should think a load is in progress.
     // In the case of LocalFrames, it means that the frame has sent a didStartLoading()
     // callback, but not the matching didStopLoading(). Inside blink, you probably
     // want Document::loadEventFinished() instead.
     void setIsLoading(bool isLoading) { m_isLoading = isLoading; }
     bool isLoading() const { return m_isLoading; }
 
     virtual WindowProxyManager* getWindowProxyManager() const = 0;
 
 protected:
@@ skipping 25 matching lines @@
 {
     return m_treeNode;
 }
 
 // Allow equality comparisons of Frames by reference or pointer, interchangeably.
 DEFINE_COMPARISON_OPERATORS_WITH_REFERENCES_REFCOUNTED(Frame)
 
 } // namespace blink
 
 #endif // Frame_h