Revert "Revert "Dartium changes for custom element lifecycle events.""

Source/bindings/dart/DartUtilities.h

Index: Source/bindings/dart/DartUtilities.h
diff --git a/Source/bindings/dart/DartUtilities.h b/Source/bindings/dart/DartUtilities.h
index 12112267ca960cc7105a0d878771b369c3919e51..4e3adab3300ec172a17cb0c1a934fb23df137bd3 100644
--- a/Source/bindings/dart/DartUtilities.h
+++ b/Source/bindings/dart/DartUtilities.h
@@ -79,6 +79,7 @@ class DartUtilities {
 public:
     static const char* htmlLibraryName;
     static const char* indexedDBLibraryName;
+    static const char* svgLibraryName;
 
     static Dart_Handle stringImplToDartString(StringImpl*);
     static Dart_Handle stringToDartString(const String&);
@@ -479,6 +480,7 @@ public:
     static bool isBlob(Dart_Handle);
     static bool isImageData(Dart_Handle);
     static bool isIDBKeyRange(Dart_Handle);
+    static bool isTypeSubclassOf(Dart_Handle type, const char* libraryName, const char* typeName);
 
     static bool isTypedData(Dart_Handle);
 
@@ -550,6 +552,7 @@ public:
 
 private:
     static PassRefPtr<StringImpl> toStringImpl(Dart_Handle, intptr_t charsize, intptr_t strlength, Dart_Handle& exception);
+    static bool objectIsClass(Dart_Handle, Dart_Handle cls);
     static bool objectIsType(Dart_Handle, const char* libraryName, const char* typeName);
 };