Added 'dynamic' keyword, so that 'Dynamic' can be deprecated.

lib/compiler/implementation/scanner/parser.dart

Index: lib/compiler/implementation/scanner/parser.dart
diff --git a/lib/compiler/implementation/scanner/parser.dart b/lib/compiler/implementation/scanner/parser.dart
index 4f4f5ddba2aba43b2f61400ae36a5585d69f63d0..49e47b4930bfee8734522d0e51acfb8da77c49f3 100644
--- a/lib/compiler/implementation/scanner/parser.dart
+++ b/lib/compiler/implementation/scanner/parser.dart
@@ -322,7 +322,11 @@ class Parser {
     if (kind === KEYWORD_TOKEN) {
       Keyword keyword = token.value;
       String value = keyword.stringValue;
-      return keyword.isPseudo || (value === 'Dynamic') || (value === 'void');
+      // TODO(aprelev@gmail.com): Remove deprecated Dynamic keyword support.
+      return keyword.isPseudo
+          || (value === 'dynamic')
+          || (value === 'Dynamic')
+          || (value === 'void');
     }
     return false;
   }