add a view for users to explore pub packages

editor/tools/plugins/com.google.dart.tools.core/src/com/google/dart/tools/core/pub/IPubPackageListener.java

Index: editor/tools/plugins/com.google.dart.tools.core/src/com/google/dart/tools/core/pub/IPubPackageListener.java
===================================================================
--- editor/tools/plugins/com.google.dart.tools.core/src/com/google/dart/tools/core/pub/IPubPackageListener.java	(revision 0)
+++ editor/tools/plugins/com.google.dart.tools.core/src/com/google/dart/tools/core/pub/IPubPackageListener.java	(revision 0)
@@ -0,0 +1,28 @@
+/*
+ * Copyright (c) 2013, the Dart project authors.
+ * 
+ * Licensed under the Eclipse Public License v1.0 (the "License"); you may not use this file except
+ * in compliance with the License. You may obtain a copy of the License at
+ * 
+ * http://www.eclipse.org/legal/epl-v10.html
+ * 
+ * Unless required by applicable law or agreed to in writing, software distributed under the License
+ * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ * or implied. See the License for the specific language governing permissions and limitations under
+ * the License.
+ */
+package com.google.dart.tools.core.pub;
+
+import java.util.List;
+
+/**
+ * A listener that watches for updates to the pub packages list from pub.dartlang
+ */
+public interface IPubPackageListener {
+
+  /**
+   * Notifies that the pub packages list has been updated with latest information from pub.dartlang
+   */
+  void pubPackagesChanged(List<PubPackageObject> pubPackages);
+
+}