Make the crypto library an official dart:crypto library.

runtime/bin/main.cc

Index: runtime/bin/main.cc
diff --git a/runtime/bin/main.cc b/runtime/bin/main.cc
index d9a0c379f02c6513d8794f21d98de4bd68ef7f38..a4c3f233f9b64e5f907d1751ed1f1beb02c77c49 100644
--- a/runtime/bin/main.cc
+++ b/runtime/bin/main.cc
@@ -335,7 +335,9 @@ static Dart_Handle LibraryTagHandler(Dart_LibraryTag tag,
   if (is_dart_scheme_url) {
     ASSERT(tag == kImportTag);
     // Handle imports of other built-in libraries present in the SDK.
-    if (DartUtils::IsDartIOLibURL(url_string)) {
+    if (DartUtils::IsDartCryptoLibURL(url_string)) {
+      return Builtin::LoadLibrary(Builtin::kCryptoLibrary);
+    } else if (DartUtils::IsDartIOLibURL(url_string)) {
       return Builtin::LoadLibrary(Builtin::kIOLibrary);
     } else if (DartUtils::IsDartJsonLibURL(url_string)) {
       return Builtin::LoadLibrary(Builtin::kJsonLibrary);