Added ad counting functionality

include.preload.js

 /*
  * This file is part of Adblock Plus <http://adblockplus.org/>,
  * Copyright (C) 2006-2013 Eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 var SELECTOR_GROUP_SIZE = 20;
 
 var elemhideElt = null;
 
+// onRequest and sendRequest are deprecated as of Chrome 20
+var ChromeCompat = {
+  runtime: {
+    onMessage: ("runtime" in chrome) ? chrome.runtime.onMessage : chrome.extension.onRequest,
+    sendMessage: ("runtime" in chrome) ? chrome.runtime.sendMessage : chrome.extension.sendRequest
+  }
+};
+
 // Sets the currently used CSS rules for elemhide filters
 function setElemhideCSSRules(selectors)
 {
   if (elemhideElt && elemhideElt.parentNode)
     elemhideElt.parentNode.removeChild(elemhideElt);
 
   if (!selectors)
     return;
 
   elemhideElt = document.createElement("style");
@@ skipping 62 matching lines @@
 }
 
 function init()
 {
   // Make sure this is really an HTML page, as Chrome runs these scripts on just about everything
   if (!(document.documentElement instanceof HTMLElement))
     return;
 
   document.addEventListener("error", checkCollapse, true);
   document.addEventListener("load", checkCollapse, true);
-
+  
   chrome.extension.sendRequest({reqtype: "get-settings", selectors: true, frameUrl: window.location.href}, function(response)
   {
     setElemhideCSSRules(response.selectors);
   });
+
+  // Make sure to only count stats in top level frame
+  if (window.top !== window)
+    return;
+  
+  var stats = {
+    blocked: 0
+  };

[Wladimir Palant, 2013/09/18 09:44:41]

Seeing that the content script is merely used to store data here - this isn't
really necessary. The blocking happens in the background page, it's logical to
store the data there as well. webrequest.js already builds up a data structure
for tabs/frames. You can call getFrameData(tabId, 0) to get the data for the
top-level frame and add/update the "blockedCount" property there.

+  ChromeCompat.runtime.onMessage.addListener(function(request, sender, sendResponse)
+  {
+    switch (request.reqtype)
+    {
+      case "get-stats":
+        sendResponse(stats);
+        break;
+      case "update-stats":
+        if (request.blocked)
+          stats.blocked++;
+        break;
+    }
+  });
 }
 
 // In Chrome 18 the document might not be initialized yet
 if (document.documentElement)
   init();
 else
   window.setTimeout(init, 0);