close channel and exit analysis server on editor shutdown

editor/tools/plugins/com.google.dart.server_test/src/com/google/dart/server/internal/remote/ByteRequestSinkTest.java

Index: editor/tools/plugins/com.google.dart.server_test/src/com/google/dart/server/internal/remote/ByteRequestSinkTest.java
diff --git a/editor/tools/plugins/com.google.dart.server_test/src/com/google/dart/server/internal/remote/ByteRequestSinkTest.java b/editor/tools/plugins/com.google.dart.server_test/src/com/google/dart/server/internal/remote/ByteRequestSinkTest.java
index df4715017d969cbb7a0be4d35b90a085becd168b..288f69b7f52e3ea1c3005e883b05ad1641ca303a 100644
--- a/editor/tools/plugins/com.google.dart.server_test/src/com/google/dart/server/internal/remote/ByteRequestSinkTest.java
+++ b/editor/tools/plugins/com.google.dart.server_test/src/com/google/dart/server/internal/remote/ByteRequestSinkTest.java
@@ -57,6 +57,20 @@ public class ByteRequestSinkTest extends TestCase {
     verify(debugStream).println(anyString());
   }
 
+  public void test_close() throws Exception {
+    ByteRequestSink requestSink = new ByteRequestSink(byteStream, null);
+    JsonObject originalJsonObject = parseJson(//
+        "{",
+        "  'id': '0',",
+        "  'method': 'server.shutdown'",
+        "}");
+    // assert write after close is ignored
+    requestSink.close();
+    requestSink.add(originalJsonObject);
+    byte[] bytes = byteStream.toByteArray();
+    assertEquals(0, bytes.length);
+  }
+
   /**
    * Builds a JSON string from the given lines. Replaces single quotes with double quotes. Then
    * parses this string as a {@link JsonObject}.