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diff --git a/chromium/services/data_decoder/public/cpp/decode_image.h b/chromium/services/data_decoder/public/cpp/decode_image.h
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+++ b/chromium/services/data_decoder/public/cpp/decode_image.h
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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.
+
+#ifndef SERVICES_DATA_DECODER_PUBLIC_CPP_DECODE_H_
+#define SERVICES_DATA_DECODER_PUBLIC_CPP_DECODE_H_
+
+#include <stdint.h>
+
+#include <vector>
+
+#include "services/data_decoder/public/interfaces/image_decoder.mojom.h"
+
+namespace gfx {
+class Size;
+}
+
+namespace service_manager {
+class Connector;
+}
+
+namespace data_decoder {
+
+const uint64_t kDefaultMaxSizeInBytes = 128 * 1024 * 1024;
+
+// Helper function to decode an image via the data_decoder service. For images
+// with multiple frames (e.g. ico files), a frame with a size as close as
+// possible to |desired_image_frame_size| is chosen (tries to take one in larger
+// size if there's no precise match). Passing gfx::Size() as
+// |desired_image_frame_size| is also supported and will result in chosing the
+// smallest available size.
+// Upon completion, |callback| is invoked on the calling thread TaskRunner with
+// an SkBitmap argument. The SkBitmap will be null on failure and non-null on
+// success.
+void DecodeImage(service_manager::Connector* connector,
+                 const std::vector<uint8_t>& encoded_bytes,
+                 mojom::ImageCodec codec,
+                 bool shrink_to_fit,
+                 uint64_t max_size_in_bytes,
+                 const gfx::Size& desired_image_frame_size,
+                 const mojom::ImageDecoder::DecodeImageCallback& callback);
+
+}  // namespace data_decoder
+
+#endif  // SERVICES_DATA_DECODER_PUBLIC_CPP_DECODE_H_