Add class id to debugger stack trace

runtime/bin/dbg_message.cc

Index: runtime/bin/dbg_message.cc
===================================================================
--- runtime/bin/dbg_message.cc	(revision 35210)
+++ runtime/bin/dbg_message.cc	(working copy)
@@ -473,8 +473,9 @@
     res = Dart_GetActivationFrame(trace, i, &frame);
     ASSERT_NOT_ERROR(res);
     Dart_Handle func_name;
+    Dart_Handle func;
     Dart_CodeLocation location;
-    res = Dart_ActivationFrameGetLocation(frame, &func_name, NULL, &location);
+    res = Dart_ActivationFrameGetLocation(frame, &func_name, &func, &location);
     ASSERT_NOT_ERROR(res);
     ASSERT(Dart_IsString(func_name));
     msg->Printf("%s{\"functionName\":", (i > 0) ? "," : "");
@@ -486,6 +487,13 @@
       msg->Printf(",\"libraryId\":%d,", location.library_id);
       msg->Printf("\"tokenOffset\":%d}", location.token_pos);
     }
+    ASSERT_NOT_ERROR(func);
+    Dart_Handle origin = Dart_GetFunctionOrigin(func);
+    ASSERT_NOT_ERROR(origin);
+    if (Dart_IsInteger(origin)) {
+      int64_t class_id = GetIntValue(origin);
+      msg->Printf(",\"classId\":%" Pd64 "", class_id);
+    }
     Dart_Handle locals = Dart_GetLocalVariables(frame);
     ASSERT_NOT_ERROR(locals);
     msg->Printf(",\"locals\":");