[Extensions] Change renderer-side web accessible resource determination

extensions/renderer/extensions_renderer_client.h

Index: extensions/renderer/extensions_renderer_client.h
diff --git a/extensions/renderer/extensions_renderer_client.h b/extensions/renderer/extensions_renderer_client.h
index 8ead04cf2016c92c9a1855983698f1c084d77836..2ef7246658ef5c816e3d7e00e1c29bd3022aa954 100644
--- a/extensions/renderer/extensions_renderer_client.h
+++ b/extensions/renderer/extensions_renderer_client.h
@@ -5,7 +5,10 @@
 #ifndef EXTENSIONS_RENDERER_EXTENSIONS_RENDERER_CLIENT_H_
 #define EXTENSIONS_RENDERER_EXTENSIONS_RENDERER_CLIENT_H_
 
+#include "extensions/common/extension_id.h"
+
 namespace extensions {
+class Extension;
 class Dispatcher;
 
 // Interface to allow the extensions module to make render-process-specific
@@ -29,6 +32,11 @@ class ExtensionsRendererClient {
   // Returns the associated Dispatcher.
   virtual Dispatcher* GetDispatcher() = 0;
 
+  // Notifies the client when an extension is added or removed.
+  // TODO(devlin): Make a RendererExtensionRegistryObserver?
+  virtual void OnExtensionLoaded(const Extension& extension) {}
+  virtual void OnExtensionUnloaded(const ExtensionId& extension) {}
+
   // Returns the single instance of |this|.
   static ExtensionsRendererClient* Get();