Add ContentSuggestionsMediator

ios/chrome/browser/suggestions/image_fetcher_impl.mm

 // 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.
 
 #include "ios/chrome/browser/suggestions/image_fetcher_impl.h"
 
 #import <UIKit/UIKit.h>
 
 #include "base/memory/ptr_util.h"
 #include "base/threading/sequenced_worker_pool.h"
@@ skipping 22 matching lines @@
 void ImageFetcherImpl::SetImageFetcherDelegate(
     image_fetcher::ImageFetcherDelegate* delegate) {
   DCHECK(delegate);
   delegate_ = delegate;
 }
 
 void ImageFetcherImpl::SetDataUseServiceName(
     DataUseServiceName data_use_service_name) {
   // Not implemented - will be obsolete once iOS also uses
   // image_fetcher::ImageDataFetcher.
-  NOTREACHED();

[gambard, 2017/01/25 12:53:49]

This is being fixed in another CL.

 }
 
 void ImageFetcherImpl::StartOrQueueNetworkRequest(
     const std::string& id,
     const GURL& image_url,
     base::Callback<void(const std::string&, const gfx::Image&)> callback) {
   if (image_url.is_empty()) {
     gfx::Image empty_image;
     callback.Run(id, empty_image);
     if (delegate_) {
@@ skipping 22 matching lines @@
         gfx::Image empty_image;
         callback.Run(fetch_id, empty_image);
         if (delegate_) {
           delegate_->OnImageFetched(fetch_id, empty_image);
         }
       };
   image_fetcher_->StartDownload(image_url, fetcher_callback);
 }
 
 }  // namespace suggestions