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 92e24577b9f2ee5c77c92980883cb11fcc94c011..ee872deece0ebde4e726f8399aec292c4d93c38c 100644
--- a/chrome/browser/extensions/extension_system_impl.h
+++ b/chrome/browser/extensions/extension_system_impl.h
@@ -19,6 +19,7 @@ class ExtensionSystemSharedFactory;
 class NavigationObserver;
 class SharedUserScriptMaster;
 class StateStoreNotificationObserver;
+// class SidebarManager;
 
 // The ExtensionSystem for ProfileImpl and OffTheRecordProfileImpl.
 // Implementation details: non-shared services are owned by
@@ -56,6 +57,9 @@ class ExtensionSystemImpl : public ExtensionSystem {
   scoped_ptr<ExtensionSet> GetDependentExtensions(
       const Extension* extension) override;
 
+  SidebarManager* sidebar_manager() override;
+  void CreateSidebarManager();
+
  private:
   friend class ExtensionSystemSharedFactory;
 
@@ -122,6 +126,8 @@ class ExtensionSystemImpl : public ExtensionSystem {
 
   Shared* shared_;
 
+  scoped_ptr<SidebarManager> sidebar_manager_;
+
   DISALLOW_COPY_AND_ASSIGN(ExtensionSystemImpl);
 };