Add baked-in favicons for default popular sites on NTP

components/ntp_tiles/most_visited_sites_unittest.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_tiles/most_visited_sites.h"
 
 #include <stddef.h>
 
 #include <memory>
 #include <ostream>
@@ skipping 177 matching lines @@
  public:
   MOCK_METHOD1(OnMostVisitedURLsAvailable, void(const NTPTilesVector& tiles));
   MOCK_METHOD1(OnIconMadeAvailable, void(const GURL& site_url));
 };
 
 class MockIconCacher : public IconCacher {
  public:
   MOCK_METHOD2(StartFetch,
                void(PopularSites::Site site,
                     const base::Callback<void(bool)>& done));
+  MOCK_METHOD2(AddDefaultImage,
+               void(const PopularSites::Site& site, int image_resource_id));
 };
 
 class PopularSitesFactoryForTest {
  public:
   PopularSitesFactoryForTest(
       bool enabled,
       sync_preferences::TestingPrefServiceSyncable* pref_service)
       : prefs_(pref_service),
         url_fetcher_factory_(/*default_factory=*/nullptr),
         url_request_context_(new net::TestURLRequestContextGetter(
@@ skipping 596 matching lines @@
                   MatchesTile("Site 4", "https://www.site4.com/",
                               NTPTileSource::TOP_SITES),
                   MatchesTile("Site 1", "https://www.site1.com/",
                               NTPTileSource::POPULAR),
                   MatchesTile("Site 2", "https://www.site2.com/",
                               NTPTileSource::POPULAR)));
 }
 
 }  // namespace
 }  // namespace ntp_tiles