Heartbeat implementation of dart:mirrors.

runtime/vm/object_store.h

Index: runtime/vm/object_store.h
===================================================================
--- runtime/vm/object_store.h	(revision 5107)
+++ runtime/vm/object_store.h	(working copy)
@@ -262,6 +262,11 @@
     native_wrappers_library_ = value.raw();
   }
 
+  RawLibrary* mirrors_library() const { return mirrors_library_; }
+  void set_mirrors_library(const Library& value) {
+    mirrors_library_ = value.raw();
+  }
+
   RawLibrary* root_library() const { return root_library_; }
   void set_root_library(const Library& value) {
     root_library_ = value.raw();
@@ -373,6 +378,7 @@
   RawLibrary* core_library_;
   RawLibrary* core_impl_library_;
   RawLibrary* isolate_library_;
+  RawLibrary* mirrors_library_;
   RawLibrary* native_wrappers_library_;
   RawLibrary* root_library_;
   RawLibrary* registered_libraries_;