Add an experimental permissions API for extensions.

chrome/renderer/extensions/extension_dispatcher.h

Index: chrome/renderer/extensions/extension_dispatcher.h
diff --git a/chrome/renderer/extensions/extension_dispatcher.h b/chrome/renderer/extensions/extension_dispatcher.h
index f2ae6fe991cb7d6484c811de36a12e994d73b6ec..f1fb8e452e95e0b0b5e5d3d3a375da2a0af9de44 100644
--- a/chrome/renderer/extensions/extension_dispatcher.h
+++ b/chrome/renderer/extensions/extension_dispatcher.h
@@ -20,6 +20,7 @@ class RenderThread;
 class URLPattern;
 class UserScriptSlave;
 struct ExtensionMsg_Loaded_Params;
+struct ExtensionMsg_UpdatePermissions_Params;
 
 namespace base {
 class ListValue;
@@ -77,6 +78,10 @@ class ExtensionDispatcher : public RenderProcessObserver {
       const std::vector<std::string>& page_actions);
   void OnActivateApplication(const std::string& extension_id);
   void OnActivateExtension(const std::string& extension_id);
+  void OnUpdatePermissions(const std::string& extension_id,
+                           const ExtensionAPIPermissionSet& apis,
+                           const URLPatternSet& explicit_hosts,
+                           const URLPatternSet& scriptable_hosts);
   void OnUpdateUserScripts(base::SharedMemoryHandle table);
 
   // Update the list of active extensions that will be reported when we crash.