Add a link (to view Permissions) to the Extension details on chrome://extensions.

chrome/browser/ui/webui/extensions/extension_settings_handler.h

Index: chrome/browser/ui/webui/extensions/extension_settings_handler.h
===================================================================
--- chrome/browser/ui/webui/extensions/extension_settings_handler.h	(revision 179321)
+++ chrome/browser/ui/webui/extensions/extension_settings_handler.h	(working copy)
@@ -12,6 +12,7 @@
 #include "base/memory/scoped_ptr.h"
 #include "base/prefs/public/pref_change_registrar.h"
 #include "base/scoped_observer.h"
+#include "chrome/browser/extensions/extension_install_prompt.h"
 #include "chrome/browser/extensions/extension_install_ui.h"
 #include "chrome/browser/extensions/extension_uninstall_dialog.h"
 #include "chrome/browser/extensions/extension_warning_service.h"
@@ -66,6 +67,7 @@
       public content::NotificationObserver,
       public content::WebContentsObserver,
       public ui::SelectFileDialog::Listener,
+      public ExtensionInstallPrompt::Delegate,
       public ExtensionUninstallDialog::Delegate,
       public extensions::ExtensionWarningService::Observer,
       public base::SupportsWeakPtr<ExtensionSettingsHandler> {
@@ -121,6 +123,10 @@
   // extensions::ExtensionWarningService::Observer implementation.
   virtual void ExtensionWarningsChanged() OVERRIDE;
 
+  // ExtensionInstallPrompt::Delegate implementation.
+  virtual void InstallUIProceed() OVERRIDE;
+  virtual void InstallUIAbort(bool user_initiated) OVERRIDE;
+
   // Helper method that reloads all unpacked extensions.
   void ReloadUnpackedExtensions();
 
@@ -157,6 +163,9 @@
   // Callback for "options" message.
   void HandleOptionsMessage(const base::ListValue* args);
 
+  // Callback for "permissions" message.
+  void HandlePermissionsMessage(const base::ListValue* args);
+
   // Callback for "showButton" message.
   void HandleShowButtonMessage(const base::ListValue* args);
 
@@ -245,6 +254,9 @@
   // one to abort.
   scoped_ptr<extensions::RequirementsChecker> requirements_checker_;
 
+  // The UI for showing what permissions the extension has.
+  scoped_ptr<ExtensionInstallPrompt> prompt_;
+
   ScopedObserver<extensions::ExtensionWarningService,
                  extensions::ExtensionWarningService::Observer>
       warning_service_observer_;