Add class and address information to heap map; display on hover.

runtime/vm/service.cc

Index: runtime/vm/service.cc
===================================================================
--- runtime/vm/service.cc	(revision 33794)
+++ runtime/vm/service.cc	(working copy)
@@ -915,7 +915,8 @@
 static bool HandleClasses(Isolate* isolate, JSONStream* js) {
   if (js->num_arguments() == 1) {
     ClassTable* table = isolate->class_table();
-    table->PrintToJSONStream(js);
+    JSONObject jsobj(js);
+    table->PrintToJSONObject(&jsobj);
     return true;
   }
   ASSERT(js->num_arguments() >= 2);
@@ -1413,7 +1414,7 @@
 
 
 static bool HandleHeapMap(Isolate* isolate, JSONStream* js) {
-  isolate->heap()->PrintHeapMapToJSONStream(js);
+  isolate->heap()->PrintHeapMapToJSONStream(isolate, js);
   return true;
 }