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

lib/compiler/implementation/dart_backend/placeholder_collector.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 class LocalPlaceholder {
   final String identifier;
   final Set<Node> nodes;
   LocalPlaceholder(this.identifier) : nodes = new Set<Node>();
   int hashCode() => identifier.hashCode();
   String toString() =>
@@ skipping 397 matching lines @@
   static bool isPlainTypeName(TypeAnnotation typeAnnotation) {
     if (typeAnnotation.typeName is !Identifier) return false;
     if (typeAnnotation.typeArguments === null) return true;
     if (typeAnnotation.typeArguments.length === 0) return true;
     return false;
   }
 
   static bool isDynamicType(TypeAnnotation typeAnnotation) {
     if (!isPlainTypeName(typeAnnotation)) return false;
     String name = typeAnnotation.typeName.asIdentifier().source.slowToString();
-    return name == 'Dynamic';
+    // TODO(aprelev@gmail.com): Removed deprecated Dynamic keyword support.
+    return name == 'Dynamic' || name == 'dynamic';
   }
 
   visitTypeAnnotation(TypeAnnotation node) {
     // Poor man generic variables resolution.
     // TODO(antonm): get rid of it once resolver can deal with it.
     TypeDeclarationElement typeDeclarationElement;
     if (currentElement is TypeDeclarationElement) {
       typeDeclarationElement = currentElement;
     } else {
       typeDeclarationElement = currentElement.getEnclosingClass();
@@ skipping 174 matching lines @@
 
   visitBlock(Block node) {
     for (Node statement in node.statements.nodes) {
       if (statement is VariableDefinitions) {
         makeVarDeclarationTypePlaceholder(statement);
       }
     }
     node.visitChildren(this);
   }
 }