Refactor how we report reload results

runtime/vm/isolate_reload.cc

Index: runtime/vm/isolate_reload.cc
diff --git a/runtime/vm/isolate_reload.cc b/runtime/vm/isolate_reload.cc
index f1744069b084e244b4a4214e5c3873600ae23a55..d53e3f2ada1247b3b5ebf17eb459652f5bee6655 100644
--- a/runtime/vm/isolate_reload.cc
+++ b/runtime/vm/isolate_reload.cc
@@ -212,12 +212,12 @@ void ClassReasonForCancelling::AppendTo(JSONArray* array) {
   jsobj.AddProperty("message", message);
 }
 
+
 RawError* IsolateReloadContext::error() const {
   ASSERT(has_error());
   // Report the first error to the surroundings.
   const Error& error =
       Error::Handle(reasons_to_cancel_reload_.At(0)->ToError());
-  OS::Print("[[%s]]\n", error.ToCString());
   return error.raw();
 }
 
@@ -355,11 +355,13 @@ bool IsolateReloadContext::IsSameLibrary(
 }
 
 
-IsolateReloadContext::IsolateReloadContext(Isolate* isolate)
+IsolateReloadContext::IsolateReloadContext(Isolate* isolate,
+                                           JSONStream* js)
     : start_time_micros_(OS::GetCurrentMonotonicMicros()),
       reload_timestamp_(OS::GetCurrentTimeMillis()),
       isolate_(isolate),
       reload_skipped_(false),
+      js_(js),
       saved_num_cids_(-1),
       saved_class_table_(NULL),
       num_saved_libs_(-1),
@@ -539,11 +541,7 @@ void IsolateReloadContext::FinishReload() {
 
   BackgroundCompiler::Enable();
 
-  if (FLAG_trace_reload) {
-    JSONStream stream;
-    ReportOnJSON(&stream);
-    OS::Print("\nJSON report:\n  %s\n", stream.ToCString());
-  }
+  ReportOnJSON(js_);
 }