Initial implementation for lazy compound assignment operators

pkg/analyzer/lib/dart/ast/token.dart

Index: pkg/analyzer/lib/dart/ast/token.dart
diff --git a/pkg/analyzer/lib/dart/ast/token.dart b/pkg/analyzer/lib/dart/ast/token.dart
index 14ba3f91ba20e449de219c7f44a5bd8543d4757f..687111a2c3a71fd5c2ad2a2864fb87cfe119bb1a 100644
--- a/pkg/analyzer/lib/dart/ast/token.dart
+++ b/pkg/analyzer/lib/dart/ast/token.dart
@@ -409,6 +409,9 @@ class TokenType {
   static const TokenType AMPERSAND_AMPERSAND = const TokenType._(
       'AMPERSAND_AMPERSAND', TokenClass.LOGICAL_AND_OPERATOR, '&&');
 
+  static const TokenType AMPERSAND_AMPERSAND_EQ = const TokenType._(
+      'AMPERSAND_AMPERSAND_EQ', TokenClass.ASSIGNMENT_OPERATOR, '&&=');
+
   static const TokenType AMPERSAND_EQ =
       const TokenType._('AMPERSAND_EQ', TokenClass.ASSIGNMENT_OPERATOR, '&=');
 
@@ -426,6 +429,9 @@ class TokenType {
   static const TokenType BAR_BAR =
       const TokenType._('BAR_BAR', TokenClass.LOGICAL_OR_OPERATOR, '||');
 
+  static const TokenType BAR_BAR_EQ =
+      const TokenType._('BAR_BAR_EQ', TokenClass.ASSIGNMENT_OPERATOR, '||=');
+
   static const TokenType BAR_EQ =
       const TokenType._('BAR_EQ', TokenClass.ASSIGNMENT_OPERATOR, '|=');