Refactor how we report reload results

runtime/vm/unit_test.cc

Index: runtime/vm/unit_test.cc
diff --git a/runtime/vm/unit_test.cc b/runtime/vm/unit_test.cc
index 9c89d9c7d8bde2be03b5d08a71fa437a2bbb370c..508385597350c965d158cb6d54f4e0b2dd9e4edf 100644
--- a/runtime/vm/unit_test.cc
+++ b/runtime/vm/unit_test.cc
@@ -280,11 +280,14 @@ void TestCase::SetReloadTestScript(const char* script) {
 
 Dart_Handle TestCase::TriggerReload() {
   Isolate* isolate = Isolate::Current();
+  JSONStream js;
 
   {
     TransitionNativeToVM transition(Thread::Current());
-    isolate->ReloadSources(false,  // force_reload
+    isolate->ReloadSources(&js,
+                           false,  // force_reload
                            true);  // dont_delete_reload_context
+    fprintf(stderr, "RELOAD REPORT:\n%s\n", js.ToCString());
   }
 
   return Dart_FinalizeLoading(false);