Support default values for arrays of POD data types in mojom.

mojo/public/tests/bindings/sample_service.mojom

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 module sample {
 
 enum BarType {
   BAR_VERTICAL = 1 << 0,
   BAR_HORIZONTAL = (1 << 1) + 0,
   BAR_BOTH = BAR_VERTICAL | BAR_HORIZONTAL,
@@ skipping 10 matching lines @@
 [RequiredFields=7]
 struct Foo {
   string name = "Fooby" @8;
   int32 x @0;
   int32 y @1;
   bool a = true @2;
   bool b @3;
   bool c @4;
   Bar bar @5;
   Bar[] extra_bars @7;
-  uint8[] data @6;
+  uint8[] data = [1,2,3] @6;
   handle<message_pipe> source @9;
   handle<data_pipe_consumer>[] input_streams @10;
   handle<data_pipe_producer>[] output_streams @11;
 };
 
 [Peer=ServiceClient]
 interface Service {
   enum BazOptions {
     BAZ_REGULAR = 0,
     BAZ_EXTRA
   };
   void Frobinate(Foo foo @0, int32 baz @1, handle<message_pipe> port @2) @0;
 };
 
 [Peer=Service]
 interface ServiceClient {
   void DidFrobinate(int32 result @0) @0;
 };
 
 }