Issue 3550. Initial understanding "const".

compiler/java/com/google/dart/compiler/parser/DartParser.java

Index: compiler/java/com/google/dart/compiler/parser/DartParser.java
diff --git a/compiler/java/com/google/dart/compiler/parser/DartParser.java b/compiler/java/com/google/dart/compiler/parser/DartParser.java
index 8fb0716a93ab58ef74f8614d319a1b3fcd108005..6d847825f762ef885e4cefee480fd97a81ce94af 100644
--- a/compiler/java/com/google/dart/compiler/parser/DartParser.java
+++ b/compiler/java/com/google/dart/compiler/parser/DartParser.java
@@ -1046,7 +1046,20 @@ public class DartParser extends CompletionHooksParserBase {
         if (optionalPseudoKeyword(FACTORY_KEYWORD)) {
           modifiers = modifiers.makeFactory();
         }
-        member = done(parseMethod(modifiers, null));
+        if (peek(0).equals(Token.IDENTIFIER) && looksLikeMethodOrAccessorDefinition()) {
+          return done(parseMethod(modifiers, null));
+        }
+        // Try to find type, may be "const ^ Type field".
+        DartTypeNode type = null;
+        if (peek(1) != Token.COMMA
+            && peek(1) != Token.ASSIGN
+            && peek(1) != Token.SEMICOLON) {
+          type = parseTypeAnnotation();
+        }
+        // Parse field.
+        modifiers = modifiers.makeFinal();
+        member = parseFieldDeclaration(modifiers, type);
+        expectStatmentTerminator();
         break;
       }