Implementing URL prefix match for history thumbnail cache.

chrome/browser/ui/webui/ntp/most_visited_handler.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/ntp/most_visited_handler.h"
 
 #include <set>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 59 matching lines @@
     }
 
     UMA_HISTOGRAM_ENUMERATION("NewTabPage.MostVisitedAction", action_id,
                               NUM_NTP_FOLLOW_ACTIONS);
   }
 }
 
 void MostVisitedHandler::RegisterMessages() {
   Profile* profile = Profile::FromWebUI(web_ui());
   // Set up our sources for thumbnail and favicon data.
-  ThumbnailSource* thumbnail_src = new ThumbnailSource(profile);
-  content::URLDataSource::Add(profile, thumbnail_src);
+  ThumbnailSource* thumbnail_src_exact = new ThumbnailSource(profile, false);
+  content::URLDataSource::Add(profile, thumbnail_src_exact);
+
+  ThumbnailSource* thumbnail_src_prefix = new ThumbnailSource(profile, true);
+  content::URLDataSource::Add(profile, thumbnail_src_prefix);
 
 #if defined(OS_ANDROID)
   // Register chrome://touch-icon as a data source for touch icons or favicons.
   content::URLDataSource::Add(profile,
                               new FaviconSource(profile, FaviconSource::ANY));
 #endif
   // Register chrome://favicon as a data source for favicons.
   content::URLDataSource::Add(
       profile, new FaviconSource(profile, FaviconSource::FAVICON));
 
@@ skipping 200 matching lines @@
 #endif
 }
 
 // static
 void MostVisitedHandler::RegisterProfilePrefs(
     user_prefs::PrefRegistrySyncable* registry) {
   registry->RegisterDictionaryPref(
       prefs::kNtpMostVisitedURLsBlacklist,
       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
 }