Import Dart bindings as of Blink r188698. This merely copies the files over and does not attach any…

sky/engine/bindings-dart/core/dart/DartLibraryIds.h

Index: sky/engine/bindings-dart/core/dart/DartLibraryIds.h
diff --git a/sky/engine/core/loader/UniqueIdentifier.cpp b/sky/engine/bindings-dart/core/dart/DartLibraryIds.h
similarity index 87%
copy from sky/engine/core/loader/UniqueIdentifier.cpp
copy to sky/engine/bindings-dart/core/dart/DartLibraryIds.h
index 0d6d9b3c9e1dc27a0d61a0e075c6e12a81ee5fdb..8ac72fdb911c2dd96ba6ab1434d5233ff49c824d 100644
--- a/sky/engine/core/loader/UniqueIdentifier.cpp
+++ b/sky/engine/bindings-dart/core/dart/DartLibraryIds.h
@@ -28,17 +28,20 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#include "sky/engine/config.h"
-#include "sky/engine/core/loader/UniqueIdentifier.h"
+#ifndef DartLibraryIds_h
+#define DartLibraryIds_h
 
 namespace blink {
 
-static unsigned long s_uniqueIdentifier = 0;
+enum {
+    DartJsLibraryId = 0,
+    DartBlinkLibraryId,
+    DartHtmlLibraryId,
+    DartSvgLibraryId,
 
-unsigned long createUniqueIdentifier()
-{
-    return ++s_uniqueIdentifier;
-}
+    NumDartLibraryIds,
+};
 
-} // namespace blink
+} //  namespace blink
 
+#endif //  DartLibraryIds_h