Introduce ActiveScriptController; track active extension scripts

chrome/browser/extensions/activity_log/uma_policy.h

Index: chrome/browser/extensions/activity_log/uma_policy.h
diff --git a/chrome/browser/extensions/activity_log/uma_policy.h b/chrome/browser/extensions/activity_log/uma_policy.h
index e5ea34be863bd0abe85fc38faec34bac537e69da..5731add6d0aa83a4809f0232d47fa82905ada2a8 100644
--- a/chrome/browser/extensions/activity_log/uma_policy.h
+++ b/chrome/browser/extensions/activity_log/uma_policy.h
@@ -96,10 +96,12 @@ class UmaPolicy : public ActivityLogPolicy,
   void SetupOpenedPage(const std::string& url);
 
   // When a page is closing, remove it from the SiteMap url_status_.
-  void CleanupClosedPage(const std::string& url);
+  void CleanupClosedPage(const std::string& url,
+                         content::WebContents* web_contents);
 
   // When a page is closing, save statistics about the page to histograms.
-  void HistogramOnClose(const std::string& url);
+  void HistogramOnClose(const std::string& url,
+                        content::WebContents* web_contents);
 
   // Standardizes the way URLs are treated.
   static std::string CleanURL(const GURL& gurl);