Rewrite Shadow DOM distribution engine to support partial synchronous distribution for v1

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

Index: third_party/WebKit/Source/core/dom/DocumentOrderedMap.cpp
diff --git a/third_party/WebKit/Source/core/dom/DocumentOrderedMap.cpp b/third_party/WebKit/Source/core/dom/DocumentOrderedMap.cpp
index 5c7822bdec370e816a0b651ba83bc0b9553c927e..a7c01b5f2068fbf7ea498320fd37924269d3aa6e 100644
--- a/third_party/WebKit/Source/core/dom/DocumentOrderedMap.cpp
+++ b/third_party/WebKit/Source/core/dom/DocumentOrderedMap.cpp
@@ -35,6 +35,7 @@
 #include "core/dom/ElementTraversal.h"
 #include "core/dom/TreeScope.h"
 #include "core/html/HTMLMapElement.h"
+#include "core/html/HTMLSlotElement.h"
 
 namespace blink {
 
@@ -75,6 +76,11 @@ inline bool keyMatchesMapName(const AtomicString& key, const Element& element)
     return isHTMLMapElement(element) && toHTMLMapElement(element).getName() == key;
 }
 
+inline bool keyMatchesSlotName(const AtomicString& key, const Element& element)
+{
+    return isHTMLSlotElement(element) && toHTMLSlotElement(element).name() == key;
+}
+
 inline bool keyMatchesLowercasedMapName(const AtomicString& key, const Element& element)
 {
     return isHTMLMapElement(element) && toHTMLMapElement(element).getName().lower() == key;
@@ -195,6 +201,16 @@ Element* DocumentOrderedMap::getElementByMapName(const AtomicString& key, const
     return get<keyMatchesMapName>(key, scope);
 }
 
+// TODO(hayato): Template get<> by return type.
+HTMLSlotElement* DocumentOrderedMap::getSlotByName(const AtomicString& key, const TreeScope* scope) const
+{
+    if (Element* slot = get<keyMatchesSlotName>(key, scope)) {
+        DCHECK(isHTMLSlotElement(slot));
+        return toHTMLSlotElement(slot);
+    }
+    return nullptr;
+}
+
 Element* DocumentOrderedMap::getElementByLowercasedMapName(const AtomicString& key, const TreeScope* scope) const
 {
     return get<keyMatchesLowercasedMapName>(key, scope);