- Use a map to lookup libraries by URL.

runtime/lib/vmservice.cc

Index: runtime/lib/vmservice.cc
diff --git a/runtime/lib/vmservice.cc b/runtime/lib/vmservice.cc
index c18b8eca73d6831f2846e632971befba4f87b547..502f5107a919cb8be0fb51d2d0c3db2488fef489 100644
--- a/runtime/lib/vmservice.cc
+++ b/runtime/lib/vmservice.cc
@@ -37,7 +37,7 @@ class RegisterRunningIsolatesVisitor : public IsolateVisitor {
     const String& library_url = Symbols::DartVMService();
     ASSERT(!library_url.IsNull());
     const Library& library =
-        Library::Handle(Library::LookupLibrary(library_url));
+        Library::Handle(Library::LookupLibrary(thread, library_url));
     ASSERT(!library.IsNull());
     // Get function.
     const String& function_name =