Make the crypto library an official dart:crypto library.

runtime/bin/main.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include <stdlib.h>
 #include <string.h>
 #include <stdio.h>
 
 #include "include/dart_api.h"
 #include "include/dart_debugger_api.h"
@@ skipping 317 matching lines @@
     }
     Dart_Handle dart_args[2];
     dart_args[0] = library_url;
     dart_args[1] = url;
     return Dart_Invoke(
         builtin_lib, Dart_NewString("_resolveUri"), 2, dart_args);
   }
   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);
     } else if (DartUtils::IsDartUriLibURL(url_string)) {
       return Builtin::LoadLibrary(Builtin::kUriLibrary);
     } else if (DartUtils::IsDartUtfLibURL(url_string)) {
       return Builtin::LoadLibrary(Builtin::kUtfLibrary);
     } else {
       return Dart_Error("Do not know how to load '%s'", url_string);
     }
@@ skipping 346 matching lines @@
   Dart_ShutdownIsolate();
   // Terminate process exit-code handler.
   Process::TerminateExitCodeHandler();
 
   free(const_cast<char*>(original_script_name));
   free(const_cast<char*>(original_working_directory));
   free(const_cast<char*>(original_script_url));
 
   return 0;
 }