[Favicon] Add new fallback icon rendering flow.

chrome/browser/ui/webui/ntp/suggestions_page_handler.cc

Index: chrome/browser/ui/webui/ntp/suggestions_page_handler.cc
diff --git a/chrome/browser/ui/webui/ntp/suggestions_page_handler.cc b/chrome/browser/ui/webui/ntp/suggestions_page_handler.cc
index 4d606fe2d0c02ebc3797f0e909e93accedd24cf1..e5c553b6899920bebf1a3cdd5ce4c900261bec46 100644
--- a/chrome/browser/ui/webui/ntp/suggestions_page_handler.cc
+++ b/chrome/browser/ui/webui/ntp/suggestions_page_handler.cc
@@ -18,6 +18,7 @@
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/history/top_sites.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/ntp/ntp_stats.h"
 #include "chrome/browser/ui/webui/ntp/suggestions_combiner.h"
@@ -64,6 +65,7 @@ void SuggestionsHandler::RegisterMessages() {
   Profile* profile = Profile::FromWebUI(web_ui());
   // Set up our sources for thumbnail and favicon data.
   content::URLDataSource::Add(profile, new ThumbnailSource(profile, false));
+  content::URLDataSource::Add(profile, new FallbackIconSource());

[pkotwicz, 2015/01/23 16:00:47]

I think that SuggestionsHandler is no longer used in Chrome because
NewTabUI::IsDiscoveryInNTPEnabled() always returns false. If this is the case,
please remove this change.

I have filed http://crbug.com/450679 about killing this class entirely.

[huangs, 2015/01/23 19:47:50]

Done.

   content::URLDataSource::Add(
       profile, new FaviconSource(profile, FaviconSource::FAVICON));