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..9f821c7e99cb0acc0a059668c2e0dcc5354993e2 100644
--- a/third_party/WebKit/Source/core/dom/Element.cpp
+++ b/third_party/WebKit/Source/core/dom/Element.cpp
@@ -3056,15 +3056,30 @@ void Element::setContainsFullScreenElement(bool flag)
     pseudoStateChanged(CSSSelector::PseudoFullScreenAncestor);
 }
 
-static Element* parentCrossingFrameBoundaries(Element* element)
+static Element* nextLocalAncestorElement(Element* element)

[dcheng, 2016/05/19 22:08:39]

Suggestion: nextAncestorElement, since local is redundant with Element.

And maybe note that unlike Node::parentNode(), this can cross frame boundaries
in a comment.

[alexmos, 2016/05/19 23:58:19]

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))
+    for (Element* element = nextLocalAncestorElement(this); element; element = nextLocalAncestorElement(element))
         element->setContainsFullScreenElement(flag);
 }