Fixes for issues 10017 and 10161

editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/ast/Annotation.java

Index: editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/ast/Annotation.java
===================================================================
--- editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/ast/Annotation.java	(revision 22889)
+++ editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/ast/Annotation.java	(working copy)
@@ -13,6 +13,7 @@
  */
 package com.google.dart.engine.ast;
 
+import com.google.dart.engine.element.Element;
 import com.google.dart.engine.scanner.Token;
 
 /**
@@ -120,6 +121,21 @@
     return constructorName;
   }
 
+  /**
+   * Return the element associated with this annotation, or {@code null} if the AST structure has
+   * not been resolved or if this annotation could not be resolved.
+   * 
+   * @return the element associated with this annotation
+   */
+  public Element getElement() {
+    if (constructorName != null) {
+      return constructorName.getElement();
+    } else if (name != null) {
+      return name.getElement();
+    }
+    return null;
+  }
+
   @Override
   public Token getEndToken() {
     if (arguments != null) {