Turn the utility process image decoder into a Mojo service.

services/image_decoder/public/interfaces/image_decoder.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.
+
+module services.image_decoder;

[Ken Rockot(use gerrit already), 2015/03/24 20:35:12]

Maybe we could drop the services namespace?

[Anand Mistry (off Chromium), 2015/03/25 03:14:32]

I kinda want to keep services to minimise namespace pollution. Maybe I can drop
the image_decoder part, similar to content. Thoughts?

+
+import "services/image_decoder/public/interfaces/image.mojom";
+
+enum ImageCodec {
+  DEFAULT,
+  ROBUST_JPEG,
+};
+
+interface ImageDecoder {
+  DecodeImage(array<uint8> encoded_data, ImageCodec codec, bool shrink_to_fit)
+      => (bool success, Image? decoded_image);
+};