Move common ImageFetcher component files to core/

components/image_fetcher/image_fetcher.h

-// Copyright 2014 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_IMAGE_FETCHER_H_
-#define COMPONENTS_IMAGE_FETCHER_IMAGE_FETCHER_H_
-
-#include <string>
-
-#include "base/callback.h"
-#include "base/macros.h"
-#include "components/data_use_measurement/core/data_use_user_data.h"
-#include "components/image_fetcher/image_fetcher_delegate.h"
-#include "url/gurl.h"
-
-namespace gfx {
-class Image;
-class Size;
-}
-
-namespace image_fetcher {
-
-class ImageDecoder;
-
-struct RequestMetadata;
-
-// A class used to fetch server images. It can be called from any thread and the
-// callback will be called on the thread which initiated the fetch.
-class ImageFetcher {
- public:
-  ImageFetcher() {}
-  virtual ~ImageFetcher() {}
-
-  using ImageFetcherCallback =
-      base::Callback<void(const std::string& id,
-                          const gfx::Image& image,
-                          const RequestMetadata& metadata)>;
-
-  using DataUseServiceName = data_use_measurement::DataUseUserData::ServiceName;
-
-  virtual void SetImageFetcherDelegate(ImageFetcherDelegate* delegate) = 0;
-
-  // Sets a service name against which to track data usage.
-  virtual void SetDataUseServiceName(
-      DataUseServiceName data_use_service_name) = 0;
-
-  // Sets the desired size for images with multiple frames (like .ico files).
-  // By default, the image fetcher choses smaller images. Override to choose a
-  // frame with a size as close as possible to |size| (trying to take one in
-  // larger size if there's no precise match). Passing gfx::Size() as
-  // |size| is also supported and will result in chosing the smallest available
-  // size.
-  virtual void SetDesiredImageFrameSize(const gfx::Size& size) = 0;
-
-  // An empty gfx::Image will be returned to the callback in case the image
-  // could not be fetched.
-  virtual void StartOrQueueNetworkRequest(
-      const std::string& id,
-      const GURL& image_url,
-      const ImageFetcherCallback& callback) = 0;
-
-  virtual ImageDecoder* GetImageDecoder() = 0;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(ImageFetcher);
-};
-
-}  // namespace image_fetcher
-
-#endif  // COMPONENTS_IMAGE_FETCHER_IMAGE_FETCHER_H_