Move ImageDecoder to components/image_fetcher/content

components/image_fetcher/content/image_decoder_impl.h

Index: components/image_fetcher/content/image_decoder_impl.h
diff --git a/components/image_fetcher/content/image_decoder_impl.h b/components/image_fetcher/content/image_decoder_impl.h
new file mode 100644
index 0000000000000000000000000000000000000000..8e47b3b4b0ed94dfb1865f1f550e8bf88955e5ae
--- /dev/null
+++ b/components/image_fetcher/content/image_decoder_impl.h
@@ -0,0 +1,41 @@
+// 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 COMPONENTS_IMAGE_FETCHER_CONTENT_IMAGE_DECODER_IMPL_H_
+#define COMPONENTS_IMAGE_FETCHER_CONTENT_IMAGE_DECODER_IMPL_H_
+
+#include <memory>
+#include <string>
+#include <vector>
+
+#include "components/image_fetcher/content/image_decoder.h"
+#include "components/image_fetcher/core/image_decoder.h"
+
+namespace image_fetcher {
+
+// ImageDecoder implementation.
+class ImageDecoderImpl : public ImageDecoder {
+ public:
+  ImageDecoderImpl();
+  ~ImageDecoderImpl() override;
+
+  void DecodeImage(const std::string& image_data,
+                   const gfx::Size& desired_image_frame_size,
+                   const ImageDecodedCallback& callback) override;
+
+ private:
+  class DecodeImageRequest;
+
+  // Removes the passed image decode |request| from the internal request queue.
+  void RemoveDecodeImageRequest(DecodeImageRequest* request);
+
+  // All active image decoding requests.
+  std::vector<std::unique_ptr<DecodeImageRequest>> decode_image_requests_;
+
+  DISALLOW_COPY_AND_ASSIGN(ImageDecoderImpl);
+};
+
+}  // namespace image_fetcher
+
+#endif  // COMPONENTS_IMAGE_FETCHER_CONTENT_IMAGE_DECODER_IMPL_H_