Implement sidebar support for extension action popups

chrome/browser/extensions/extension_system_impl.h

Index: chrome/browser/extensions/extension_system_impl.h
diff --git a/chrome/browser/extensions/extension_system_impl.h b/chrome/browser/extensions/extension_system_impl.h
index f4b19c4a5cf92557969e904e2409c72898551d65..54afa3458d25269c6b42d88d712d314e015b7954 100644
--- a/chrome/browser/extensions/extension_system_impl.h
+++ b/chrome/browser/extensions/extension_system_impl.h
@@ -20,6 +20,7 @@ class InstallVerifier;
 class NavigationObserver;
 class SharedUserScriptMaster;
 class StateStoreNotificationObserver;
+// class SidebarManager;
 
 // The ExtensionSystem for ProfileImpl and OffTheRecordProfileImpl.
 // Implementation details: non-shared services are owned by
@@ -58,6 +59,9 @@ class ExtensionSystemImpl : public ExtensionSystem {
   scoped_ptr<ExtensionSet> GetDependentExtensions(
       const Extension* extension) override;
 
+  SidebarManager* sidebar_manager() override;
+  void CreateSidebarManager();
+
  private:
   friend class ExtensionSystemSharedFactory;
 
@@ -128,6 +132,8 @@ class ExtensionSystemImpl : public ExtensionSystem {
 
   Shared* shared_;
 
+  scoped_refptr<SidebarManager> sidebar_manager_;
+
   DISALLOW_COPY_AND_ASSIGN(ExtensionSystemImpl);
 };