Introduce global contexts to represent lexical global scope(s).

src/scopes.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 142 matching lines @@
   // declared before, the previously declared variable is returned.
   Variable* DeclareLocal(Handle<String> name,
                          VariableMode mode,
                          InitializationFlag init_flag,
                          Interface* interface = Interface::NewValue());
 
   // Declare an implicit global variable in this scope which must be a
   // global scope.  The variable was introduced (possibly from an inner
   // scope) by a reference to an unresolved variable with no intervening
   // with statements or eval calls.
-  Variable* DeclareGlobal(Handle<String> name);
+  Variable* DeclareDynamicGlobal(Handle<String> name);
 
   // Create a new unresolved variable.
   template<class Visitor>
   VariableProxy* NewUnresolved(AstNodeFactory<Visitor>* factory,
                                Handle<String> name,
                                Interface* interface = Interface::NewValue(),
                                int position = RelocInfo::kNoPosition) {
     // Note that we must not share the unresolved variables with
     // the same name because they may be removed selectively via
     // RemoveUnresolved().
@@ skipping 442 matching lines @@
   void SetDefaults(ScopeType type,
                    Scope* outer_scope,
                    Handle<ScopeInfo> scope_info);
 
   Zone* zone_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_SCOPES_H_