Implement FullScreen using top layer.

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

Index: third_party/WebKit/Source/core/dom/Document.cpp
diff --git a/third_party/WebKit/Source/core/dom/Document.cpp b/third_party/WebKit/Source/core/dom/Document.cpp
index dff02f7249fa660d7e136ddbdfd24c7ad473be35..3a7ce21466f628bb09e048b38d438655c5e14513 100644
--- a/third_party/WebKit/Source/core/dom/Document.cpp
+++ b/third_party/WebKit/Source/core/dom/Document.cpp
@@ -5037,9 +5037,13 @@ void Document::removeFromTopLayer(Element* element)
 
 HTMLDialogElement* Document::activeModalDialog() const
 {
-    if (m_topLayerElements.isEmpty())
-        return 0;
-    return toHTMLDialogElement(m_topLayerElements.last().get());
+    for (auto it = m_topLayerElements.rbegin(); it != m_topLayerElements.rend(); ++it) {
+        Element* currentTopLayerElement = it->get();
+        if (isHTMLDialogElement(currentTopLayerElement))

[esprehn, 2015/09/24 20:17:01]

if (isHTMLDialogElement(*it))
  return toHTMLDialogElement(it.get());

[dsinclair, 2015/09/28 17:14:58]

Done.

+            return toHTMLDialogElement(currentTopLayerElement);
+    }
+
+    return nullptr;
 }
 
 void Document::exitPointerLock()