Add support for entering/exiting HTML fullscreen from OOPIFs.

third_party/WebKit/Source/core/dom/Element.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012, 2013 Apple Inc. All rights reserved.
  *           (C) 2007 Eric Seidel (eric@webkit.org)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 3038 matching lines @@
     setAttribute(attributeName, AtomicString::number(value));
 }
 
 void Element::setContainsFullScreenElement(bool flag)
 {
     setElementFlag(ContainsFullScreenElement, flag);
     document().styleEngine().ensureFullscreenUAStyle();
     pseudoStateChanged(CSSSelector::PseudoFullScreenAncestor);
 }
 
 static Element* parentCrossingFrameBoundaries(Element* element)

[dcheng, 2016/05/18 01:04:34]

This function should probably be renamed, it's not just a parent anymore
necessarily.

[alexmos, 2016/05/18 15:08:33]

I agree the name isn't great, but it was hard to come up with something better.
:)  How does nextLocalAncestorElement sound?

[dcheng, 2016/05/19 00:21:34]

Ehh.... maybe? I'm not too thrilled with either name, but I think this is
slightly better?

[alexmos, 2016/05/19 01:08:25]

OK, done.

 {
     DCHECK(element);
-    return element->parentElement() ? element->parentElement() : element->document().localOwner();
+    if (element->parentElement())
+        return element->parentElement();
+
+    Frame* frame = element->document().frame();
+    if (!frame || !frame->owner())
+        return nullptr;
+
+    // Find the next LocalFrame on the ancestor chain, and return the
+    // corresponding <iframe> element for the remote child if it exists.
+    while (frame->tree().parent() && frame->tree().parent()->isRemoteFrame())
+        frame = frame->tree().parent();
+
+    if (frame->owner() && frame->owner()->isLocal())
+        return toHTMLFrameOwnerElement(frame->owner());
+
+    return nullptr;
 }
 
 void Element::setContainsFullScreenElementOnAncestorsCrossingFrameBoundaries(bool flag)
 {
     for (Element* element = parentCrossingFrameBoundaries(this); element; element = parentCrossingFrameBoundaries(element))
         element->setContainsFullScreenElement(flag);
 }
 
 void Element::setIsInTopLayer(bool inTopLayer)
 {
@@ skipping 634 matching lines @@
 
 DEFINE_TRACE_WRAPPERS(Element)
 {
     if (hasRareData()) {
         visitor->traceWrappers(elementRareData());
     }
     ContainerNode::traceWrappers(visitor);
 }
 
 } // namespace blink