Added ad counting functionality

include.preload.js

Index: include.preload.js
===================================================================
--- a/include.preload.js
+++ b/include.preload.js
@@ -19,6 +19,14 @@
 
 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)
 {
@@ -101,11 +109,32 @@
 
   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
+  };
+  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