Implement declarativeContent API.

chrome/browser/extensions/tab_helper.h

Index: chrome/browser/extensions/tab_helper.h
diff --git a/chrome/browser/extensions/tab_helper.h b/chrome/browser/extensions/tab_helper.h
index 0228adc8a4f6cf4fd5f8742d8a4c4e7e7dbefa45..ee20f518568c85a3574888dfcef721b1aa7f9870 100644
--- a/chrome/browser/extensions/tab_helper.h
+++ b/chrome/browser/extensions/tab_helper.h
@@ -7,6 +7,8 @@
 
 #include <map>
 #include <string>
+#include <vector>
+
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/observer_list.h"
@@ -30,6 +32,7 @@ struct LoadCommittedDetails;
 namespace extensions {
 class Extension;
 class LocationBarController;
+class RulesRegistryService;
 class ScriptBadgeController;
 class ScriptBubbleController;
 class ScriptExecutor;
@@ -193,6 +196,7 @@ class TabHelper : public content::WebContentsObserver,
       const ScriptExecutionObserver::ExecutingScriptsMap& extension_ids,
       int32 page_id,
       const GURL& on_url);
+  void OnWatchedPageChange(const std::vector<std::string>& css_selectors);
 
   // App extensions related methods:
 
@@ -267,6 +271,8 @@ class TabHelper : public content::WebContentsObserver,
 
   scoped_ptr<ScriptBubbleController> script_bubble_controller_;
 
+  RulesRegistryService* rules_registry_service_;
+
   Profile* profile_;
 
   DISALLOW_COPY_AND_ASSIGN(TabHelper);