Add DeclaredVariables to AnalysisDriver.

pkg/analyzer/lib/context/declared_variables.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library analyzer.context.declared_variables;
 
 import 'dart:collection';
 
 import 'package:analyzer/dart/constant/value.dart';
 import 'package:analyzer/src/dart/constant/value.dart';
@@ skipping 10 matching lines @@
    * A table mapping the names of declared variables to their values.
    */
   HashMap<String, String> _declaredVariables = new HashMap<String, String>();
 
   /**
    * Return the names of the variables for which a value has been defined.
    */
   Iterable<String> get variableNames => _declaredVariables.keys;
 
   /**
+   * Add all variables of [other] to this object.
+   */
+  void addAll(DeclaredVariables other) {
+    _declaredVariables.addAll(other._declaredVariables);
+  }
+
+  /**
    * Define a variable with the given [name] to have the given [value].
    */
   void define(String name, String value) {
     _declaredVariables[name] = value;
   }
 
   /**
    * Return the raw string value of the variable with the given [name],
    * or `null` of the variable is not defined.
    */
@@ skipping 49 matching lines @@
    */
   DartObject getString(TypeProvider typeProvider, String name) {
     String value = _declaredVariables[name];
     if (value == null) {
       return new DartObjectImpl(
           typeProvider.stringType, StringState.UNKNOWN_VALUE);
     }
     return new DartObjectImpl(typeProvider.stringType, new StringState(value));
   }
 }