ntp_tiles: Extend chrome://ntp-tiles-internals with favicon data

ios/chrome/browser/ui/webui/ntp_tiles_internals_ui.cc

 // Copyright 2016 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/ui/webui/ntp_tiles_internals_ui.h"
 
 #include "base/memory/ptr_util.h"
 #include "components/grit/components_resources.h"
+#include "components/keyed_service/core/service_access_type.h"
 #include "components/ntp_tiles/field_trial.h"
 #include "components/ntp_tiles/most_visited_sites.h"
 #include "components/ntp_tiles/webui/ntp_tiles_internals_message_handler.h"
 #include "components/ntp_tiles/webui/ntp_tiles_internals_message_handler_client.h"
 #include "ios/chrome/browser/browser_state/chrome_browser_state.h"
 #include "ios/chrome/browser/chrome_url_constants.h"
+#include "ios/chrome/browser/favicon/favicon_service_factory.h"
 #include "ios/chrome/browser/ntp_tiles/ios_most_visited_sites_factory.h"
 #include "ios/chrome/browser/ntp_tiles/ios_popular_sites_factory.h"
 #include "ios/web/public/web_thread.h"
 #include "ios/web/public/web_ui_ios_data_source.h"
 #include "ios/web/public/webui/web_ui_ios.h"
 #include "ios/web/public/webui/web_ui_ios_message_handler.h"
 
 namespace {
 
 // The implementation for the chrome://ntp-tiles-internals page.
 class IOSNTPTilesInternalsMessageHandlerBridge
     : public web::WebUIIOSMessageHandler,
       public ntp_tiles::NTPTilesInternalsMessageHandlerClient {
  public:
-  IOSNTPTilesInternalsMessageHandlerBridge() {}
+  // |favicon_service| must not be null and must outlive this object.
+  explicit IOSNTPTilesInternalsMessageHandlerBridge(
+      favicon::FaviconService* favicon_service)
+      : handler_(favicon_service) {}
 
  private:
   // web::WebUIIOSMessageHandler:
   void RegisterMessages() override;
 
   // ntp_tiles::NTPTilesInternalsMessageHandlerClient
   bool SupportsNTPTiles() override;
   bool DoesSourceExist(ntp_tiles::TileSource source) override;
   std::unique_ptr<ntp_tiles::MostVisitedSites> MakeMostVisitedSites() override;
   PrefService* GetPrefs() override;
@@ skipping 62 matching lines @@
   source->AddResourcePath("ntp_tiles_internals.css",
                           IDR_NTP_TILES_INTERNALS_CSS);
   source->SetDefaultResource(IDR_NTP_TILES_INTERNALS_HTML);
   return source;
 }
 
 }  // namespace
 
 NTPTilesInternalsUI::NTPTilesInternalsUI(web::WebUIIOS* web_ui)
     : web::WebUIIOSController(web_ui) {
-  web::WebUIIOSDataSource::Add(ios::ChromeBrowserState::FromWebUIIOS(web_ui),
+  ios::ChromeBrowserState* browser_state =
+      ios::ChromeBrowserState::FromWebUIIOS(web_ui);
+  web::WebUIIOSDataSource::Add(browser_state,
                                CreateNTPTilesInternalsHTMLSource());
   web_ui->AddMessageHandler(
-      base::MakeUnique<IOSNTPTilesInternalsMessageHandlerBridge>());
+      base::MakeUnique<IOSNTPTilesInternalsMessageHandlerBridge>(
+          ios::FaviconServiceFactory::GetForBrowserState(
+              browser_state, ServiceAccessType::EXPLICIT_ACCESS)));
 }
 
 NTPTilesInternalsUI::~NTPTilesInternalsUI() {}