Dart: Renames dart:mojo_blah -> mojo:blah

sky/engine/core/script/dart_loader.cc

Index: sky/engine/core/script/dart_loader.cc
diff --git a/sky/engine/core/script/dart_loader.cc b/sky/engine/core/script/dart_loader.cc
index d3d0bd44a9e5275ca15906914b9f04e5d5c408db..62a72ea0bcce5fdf92917fc7e631448db01ced12 100644
--- a/sky/engine/core/script/dart_loader.cc
+++ b/sky/engine/core/script/dart_loader.cc
@@ -26,7 +26,7 @@ Dart_Handle CanonicalizeURL(DartState* state,
                             Dart_Handle library,
                             Dart_Handle url) {
   String string = StringFromDart(url);
-  if (string.startsWith("dart:"))
+  if (string.startsWith("dart:") || string.startsWith("mojo:"))
     return url;
   // TODO(dart): Figure out how 'package:' should work in sky.
   if (string.startsWith("package:")) {
@@ -194,6 +194,14 @@ Dart_Handle DartLoader::HandleLibraryTag(Dart_LibraryTag tag,
     return CanonicalizeURL(DartState::Current(), library, url);
   if (tag == Dart_kImportTag) {
     CHECK(WTF::isMainThread());
+
+    String string = StringFromDart(url);
+    if (string.startsWith("mojo:")) {
+      Dart_Handle mojo_library = Dart_LookupLibrary(url);
+      LogIfError(mojo_library);
+      return mojo_library;
+    }
+
     return DOMDartState::Current()->loader().Import(library, url);
   }
   if (tag == Dart_kSourceTag) {