Communicate defined variables to the context

pkg/analyzer/lib/src/analyzer_impl.dart

Index: pkg/analyzer/lib/src/analyzer_impl.dart
diff --git a/pkg/analyzer/lib/src/analyzer_impl.dart b/pkg/analyzer/lib/src/analyzer_impl.dart
index e25cee54dd2fe2bf5d97943a2bb6e8c5b682abf2..d6aa8b57d6d611aa886e05a19942b4ca27a64979 100644
--- a/pkg/analyzer/lib/src/analyzer_impl.dart
+++ b/pkg/analyzer/lib/src/analyzer_impl.dart
@@ -10,6 +10,7 @@ import 'dart:io';
 
 import 'package:path/path.dart' as pathos;
 
+import 'generated/constant.dart';
 import 'generated/engine.dart';
 import 'generated/element.dart';
 import 'generated/error.dart';
@@ -251,6 +252,13 @@ class AnalyzerImpl {
     sourceFactory = new SourceFactory(resolvers);
     context = AnalysisEngine.instance.createAnalysisContext();
     context.sourceFactory = sourceFactory;
+    Map<String, String> definedVariables = options.definedVariables;
+    if (!definedVariables.isEmpty) {
+      DeclaredVariables declaredVariables = context.declaredVariables;
+      definedVariables.forEach((String variableName, String value) {
+        declaredVariables.define(variableName, value);
+      });
+    }
     // Uncomment the following to have errors reported on stdout and stderr
     AnalysisEngine.instance.logger = new StdLogger(options.log);