Initial implementation for lazy compound assignment operators

pkg/analyzer/lib/src/generated/engine.dart

Index: pkg/analyzer/lib/src/generated/engine.dart
diff --git a/pkg/analyzer/lib/src/generated/engine.dart b/pkg/analyzer/lib/src/generated/engine.dart
index e7bd28f0daa8d084cb24e56e6b84ef443fd24f82..469cb2eb7a5c681ddb0dc6ad3b66ba7ed85b3a45 100644
--- a/pkg/analyzer/lib/src/generated/engine.dart
+++ b/pkg/analyzer/lib/src/generated/engine.dart
@@ -1070,6 +1070,12 @@ abstract class AnalysisOptions {
   bool get enableGenericMethods => null;
 
   /**
+   * Return `true` to enable the lazy compound assignment operators '&&=' and
+   * '||='.
+   */
+  bool get enableLazyAssignmentOperators;
+
+  /**
    * Return `true` to strictly follow the specification when generating
    * warnings on "call" methods (fixes dartbug.com/21938).
    */
@@ -1219,6 +1225,9 @@ class AnalysisOptionsImpl implements AnalysisOptions {
    */
   bool enableGenericMethods = false;
 
+  @override
+  bool enableLazyAssignmentOperators = false;
+
   /**
    * A flag indicating whether analysis is to strictly follow the specification
    * when generating warnings on "call" methods (fixes dartbug.com/21938).