Set desired_image_size when decoding images for NTP Tile icons.

services/image_decoder/public/cpp/decode.h

 // 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_IMAGE_DECODER_PUBLIC_CPP_DECODE_H_
 #define SERVICES_IMAGE_DECODER_PUBLIC_CPP_DECODE_H_
 
 #include <stdint.h>
 
 #include <vector>
 
 #include "services/image_decoder/public/interfaces/image_decoder.mojom.h"
 
+namespace gfx {
+class Size;
+}
+
 namespace service_manager {
 class Connector;
 }
 
 namespace image_decoder {
 
 const uint64_t kDefaultMaxSizeInBytes = 128 * 1024 * 1024;
 
-// Helper function to decode an image via the image_decoder service. 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
+// Helper function to decode an image via the image_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 Decode(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 image_decoder
 
 #endif  // SERVICES_IMAGE_DECODER_PUBLIC_CPP_DECODE_H_