Add typed data interface to Dart API, this only changes the C++ API as dicussed in a previous email…

bin/crypto.cc

Index: bin/crypto.cc
===================================================================
--- bin/crypto.cc	(revision 18484)
+++ bin/crypto.cc	(working copy)
@@ -23,7 +23,7 @@
     delete[] buffer;
     Dart_ThrowException(DartUtils::NewDartOSError());
   }
-  Dart_Handle result = Dart_NewByteArray(count);
+  Dart_Handle result = Dart_NewTypedData(kUint8, count);
   if (Dart_IsError(result)) {
     delete[] buffer;
     Dart_Handle error = DartUtils::NewString("Failed to allocate storage.");