[Favicon] Add new fallback icon rendering flow.

chrome/browser/ui/webui/suggestions_internals/suggestions_internals_ui.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/ui/webui/suggestions_internals/suggestions_internals_ui.h"
 
 #include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/ui/webui/fallback_icon_source.h"
 #include "chrome/browser/ui/webui/favicon_source.h"
 #include "chrome/browser/ui/webui/suggestions_internals/suggestions_internals_ui_handler.h"
 #include "chrome/common/url_constants.h"
 #include "content/public/browser/url_data_source.h"
 #include "content/public/browser/web_ui.h"
 #include "content/public/browser/web_ui_controller.h"
 #include "content/public/browser/web_ui_data_source.h"
 #include "grit/browser_resources.h"
 
 SuggestionsInternalsUI::SuggestionsInternalsUI(content::WebUI* web_ui)
     : content::WebUIController(web_ui) {
   // Set up the chrome://suggestions-internals/ source.
   content::WebUIDataSource* html_source = content::WebUIDataSource::Create(
       chrome::kChromeUISuggestionsInternalsHost);
   html_source->AddResourcePath("suggestions_internals.css",
                                IDR_SUGGESTIONS_INTERNALS_CSS);
   html_source->AddResourcePath("suggestions_internals.js",
                                IDR_SUGGESTIONS_INTERNALS_JS);
   html_source->SetDefaultResource(IDR_SUGGESTIONS_INTERNALS_HTML);
 
   Profile* profile = Profile::FromWebUI(web_ui);
   content::WebUIDataSource::Add(profile, html_source);
+  content::URLDataSource::Add(profile, new FallbackIconSource());

[pkotwicz, 2015/01/21 19:44:15]

I don't think that this class is used for the NTP. If it isn't, then you should
probably not add FallbackIconSource.

[huangs, 2015/01/22 01:13:27]

Done.

   content::URLDataSource::Add(
       profile, new FaviconSource(profile, FaviconSource::FAVICON));
 
   // AddMessageHandler takes ownership of SuggestionsInternalsUIHandler
   web_ui->AddMessageHandler(new SuggestionsInternalsUIHandler(profile));
 }
 
 SuggestionsInternalsUI::~SuggestionsInternalsUI() { }