Add ios_image_decoder_impl.*

components/ntp_snippets/ntp_snippets_service.cc

 // Copyright 2015 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 "components/ntp_snippets/ntp_snippets_service.h"
 
 #include <algorithm>
 #include <iterator>
 #include <utility>
 
@@ skipping 611 matching lines @@
   DCHECK_GT(next_expiry, expiry);
   expiry_timer_.Start(FROM_HERE, next_expiry - expiry,
                       base::Bind(&NTPSnippetsService::ClearExpiredSnippets,
                                  base::Unretained(this)));
 }
 
 void NTPSnippetsService::OnSnippetImageFetchedFromDatabase(
     const std::string& snippet_id,
     const ImageFetchedCallback& callback,
     std::string data) {
-  // |image_decoder_| is null on iOS and in tests.
+  // |image_decoder_| is null in tests.
   if (image_decoder_ && !data.empty()) {
     image_decoder_->DecodeImage(
         std::move(data),
         base::Bind(&NTPSnippetsService::OnSnippetImageDecoded,
                    base::Unretained(this), snippet_id, callback));
     return;
   }
 
   // Fetching from the DB failed; start a network fetch.
   FetchSnippetImageFromNetwork(snippet_id, callback);
@@ skipping 163 matching lines @@
       return;
   }
 }
 
 void NTPSnippetsService::ClearDeprecatedPrefs() {
   pref_service_->ClearPref(prefs::kDeprecatedSnippets);
   pref_service_->ClearPref(prefs::kDeprecatedDiscardedSnippets);
 }
 
 }  // namespace ntp_snippets