Add support for entering/exiting HTML fullscreen from OOPIFs.

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

Index: third_party/WebKit/Source/core/dom/Element.cpp
diff --git a/third_party/WebKit/Source/core/dom/Element.cpp b/third_party/WebKit/Source/core/dom/Element.cpp
index 15c15451b2df73ca1b29a9169639cffaaf911047..36bb5f23bfea61d31c9ca91ebd9634e86d8526a1 100644
--- a/third_party/WebKit/Source/core/dom/Element.cpp
+++ b/third_party/WebKit/Source/core/dom/Element.cpp
@@ -3059,7 +3059,22 @@ void Element::setContainsFullScreenElement(bool flag)
 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)