Add |SetImageDownloadLimit| to ImageFetcher to limit downloaded bytes

components/image_fetcher/core/image_fetcher_impl.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_CORE_IMAGE_FETCHER_IMPL_H_
 #define COMPONENTS_IMAGE_FETCHER_CORE_IMAGE_FETCHER_IMPL_H_
 
 #include <map>
 #include <memory>
 #include <string>
@@ skipping 28 matching lines @@
   // Sets the |delegate| of the ImageFetcherImpl. The |delegate| has to be alive
   // during the lifetime of the ImageFetcherImpl object. It is the caller's
   // responsibility to ensure this.
   void SetImageFetcherDelegate(ImageFetcherDelegate* delegate) override;
 
   // Sets a service name against which to track data usage.
   void SetDataUseServiceName(DataUseServiceName data_use_service_name) override;
 
   void SetDesiredImageFrameSize(const gfx::Size& size) override;
 
+  void SetImageDownloadLimit(
+      base::Optional<int64_t> max_download_bytes) override;
+
   void StartOrQueueNetworkRequest(
       const std::string& id,
       const GURL& image_url,
       const ImageFetcherCallback& callback) override;
 
   ImageDecoder* GetImageDecoder() override;
 
  private:
   // State related to an image fetch (id, pending callbacks).
   struct ImageRequest {
@@ skipping 39 matching lines @@
   // Map from each image URL to the request information (associated website
   // url, fetcher, pending callbacks).
   ImageRequestMap pending_net_requests_;
 
   DISALLOW_COPY_AND_ASSIGN(ImageFetcherImpl);
 };
 
 }  // namespace image_fetcher
 
 #endif  // COMPONENTS_IMAGE_FETCHER_CORE_IMAGE_FETCHER_IMPL_H_