components/image_fetcher: Expose RequestMetadata from ImageFetcher

chrome/browser/search/thumbnail_source.cc

 // Copyright (c) 2012 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 "chrome/browser/search/thumbnail_source.h"
 
 #include <stddef.h>
 
 #include "base/callback.h"
 #include "base/memory/ptr_util.h"
@@ skipping 101 matching lines @@
     fallback_thumbnail_url_str = path.substr(pos + strlen(kUrlDelimiter));
   }
 
   *page_url = GURL(page_url_str);
   *fallback_thumbnail_url = GURL(fallback_thumbnail_url_str);
 }
 
 void ThumbnailSource::SendFetchedUrlImage(
     const content::URLDataSource::GotDataCallback& callback,
     const std::string& url,
-    const gfx::Image& image) {
+    const gfx::Image& image,
+    const image_fetcher::RequestMetadata& metadata) {
   // In case the image could not be retrieved an empty image is returned.
   if (image.IsEmpty()) {
     callback.Run(default_thumbnail_.get());
     return;
   }
 
   const SkBitmap* bitmap = image.ToSkBitmap();
   scoped_refptr<base::RefCountedBytes> encoded_data(
       new base::RefCountedBytes());
   if (!suggestions::EncodeSkBitmapToJPEG(*bitmap, &encoded_data->data())) {
     callback.Run(default_thumbnail_.get());
     return;
   }
 
   callback.Run(encoded_data.get());
 }