Add DartPackage annotation to all mojo_services mojoms

mojo/services/camera_roll/public/interfaces/camera_roll.mojom

 // Copyright 2015 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.
 
+[DartPackage="mojo_services"]
 module mojo;
 
 struct Photo {
   // A string to uniquely identify an instance of a |Photo|. This can be used
   // to de-duplicate photos over multiple runs on the camera roll.
   string unique_id;
 
   // Stream to read contents of the photo from.
   handle<data_pipe_consumer> content;
 };
 
 // |CameraRollService| provides access to the device's camera roll.
 // The camera roll is exposed as a snapshot of all photos available as a list.
 // The head of the list (element with index 0) is a photo with the latest
 // timestamp and subsequent elements are in decreasing order of timestamp.
 interface CameraRollService {
   // Updates the snapshot of all photos available. Photos might have been added
   // or removed after the service was started or |Update| was called.
   Update();
   // Get the number of photos available in the current snapshot.
   GetCount() => (uint32 num_photos);
   // Get the photo from the current snapshot at |index|. null will be returned
   // if such an index is out-of-bounds.
   GetPhoto(uint32 index) => (Photo? photo);
 };