- Allow patching of top-level methods and accessors.

runtime/vm/object.h

Index: runtime/vm/object.h
===================================================================
--- runtime/vm/object.h	(revision 10353)
+++ runtime/vm/object.h	(working copy)
@@ -1963,6 +1963,7 @@
   // more regular.
   void AddClass(const Class& cls) const;
   void AddObject(const Object& obj, const String& name) const;
+  void ReplaceObject(const Object& obj, const String& name) const;
   RawObject* LookupObject(const String& name) const;
   RawClass* LookupClass(const String& name) const;
   RawClass* LookupClassAllowPrivate(const String& name) const;
@@ -1998,6 +1999,8 @@
     raw_ptr()->native_entry_resolver_ = value;
   }
 
+  RawError* Patch(const String& url, const String& source) const;
+
   RawString* PrivateName(const String& name) const;
 
   intptr_t index() const { return raw_ptr()->index_; }