Introduce the image_decoder service

services/image_decoder/public/interfaces/image_decoder.mojom

Index: services/image_decoder/public/interfaces/image_decoder.mojom
diff --git a/services/image_decoder/public/interfaces/image_decoder.mojom b/services/image_decoder/public/interfaces/image_decoder.mojom
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+// Copyright 2016 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 image_decoder.mojom;
+
+import "skia/public/interfaces/bitmap.mojom";
+
+enum ImageCodec {
+  DEFAULT,
+  ROBUST_JPEG,
+  ROBUST_PNG,
+};
+
+interface ImageDecoder {
+  // Decodes image data to a raw skia bitmap.
+  //
+  // If the total size of the decoded image data in bytes exceeds
+  // |max_size_in_bytes| and |shrink_to_fit| is true, the image is halved
+  // successively until its total size no longer exceeds |max_size_in_bytes|.
+  //
+  // If the total size of the decoded image data in bytes exceeds
+  // |max_size_in_bytes| and |shrink_to_fit| is false, this is treated as a
+  // decoding failure and the |decoded_image| response is null.
+  DecodeImage(array<uint8> encoded_data, ImageCodec codec, bool shrink_to_fit,
+              int64 max_size_in_bytes)
+      => (skia.mojom.Bitmap? decoded_image);
+};