Add ios_image_decoder_impl.*

ios/chrome/browser/suggestions/ios_image_decoder_impl.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 IOS_CHROME_BROWSER_SUGGESTIONS_IOS_IMAGE_DECODER_IMPL_H_
+#define IOS_CHROME_BROWSER_SUGGESTIONS_IOS_IMAGE_DECODER_IMPL_H_
+
+#include "base/macros.h"
+#include "components/image_fetcher/image_decoder.h"
+
+namespace suggestions {
+
+class IOSImageDecoderImpl : public image_fetcher::ImageDecoder {
+ public:
+  IOSImageDecoderImpl();
+  ~IOSImageDecoderImpl() override;
+
+  void DecodeImage(
+      const std::string& image_data,
+      const image_fetcher::ImageDecodedCallback& callback) override;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(IOSImageDecoderImpl);
+};
+
+}  // namespace suggestions
+
+#endif  // IOS_CHROME_BROWSER_SUGGESTIONS_IOS_IMAGE_DECODER_IMPL_H_