Make the crypto library an official dart:crypto library.

runtime/bin/gen_snapshot.cc

Index: runtime/bin/gen_snapshot.cc
diff --git a/runtime/bin/gen_snapshot.cc b/runtime/bin/gen_snapshot.cc
index 8da048c1687099e9abb714a0e43ce9e81da0b541..6f870305f65cc06f20c2679d95ae27f7855dae54 100644
--- a/runtime/bin/gen_snapshot.cc
+++ b/runtime/bin/gen_snapshot.cc
@@ -183,7 +183,9 @@ static Dart_Handle BuiltinLibraryTagHandler(Dart_LibraryTag tag,
     }
     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);
@@ -300,6 +302,8 @@ int main(int argc, char** argv) {
     Dart_Handle library =
         LoadGenericSnapshotCreationScript(Builtin::kBuiltinLibrary);
     VerifyLoaded(library);
+    library = LoadGenericSnapshotCreationScript(Builtin::kCryptoLibrary);
+    VerifyLoaded(library);
     library = LoadGenericSnapshotCreationScript(Builtin::kIOLibrary);
     VerifyLoaded(library);
     library = LoadGenericSnapshotCreationScript(Builtin::kJsonLibrary);