Implement sidebar support for extension action popups

chrome/browser/ui/toolbar/toolbar_actions_bar.h

Index: chrome/browser/ui/toolbar/toolbar_actions_bar.h
diff --git a/chrome/browser/ui/toolbar/toolbar_actions_bar.h b/chrome/browser/ui/toolbar/toolbar_actions_bar.h
index a0e1b7c0f400b455cbfc32ce192cd1fae583ae1b..6865651459d4df334e20a732b778dd8c07c0cad6 100644
--- a/chrome/browser/ui/toolbar/toolbar_actions_bar.h
+++ b/chrome/browser/ui/toolbar/toolbar_actions_bar.h
@@ -166,6 +166,12 @@ class ToolbarActionsBar : public ToolbarActionsModel::Observer {
   // Hides the actively showing popup, if any.
   void HideActivePopup();
 
+  // Sets the active sidebar owner to be |sidebar_owner|.
+  void SetSidebarOwner(ToolbarActionViewController* sidebar_owner);
+
+  // Hides the actively showing sidebar, if any.
+  void HideActiveSidebar();
+
   // Returns the main (i.e., not overflow) controller for the given action.
   ToolbarActionViewController* GetMainControllerForAction(
       ToolbarActionViewController* action);
@@ -264,6 +270,10 @@ class ToolbarActionsBar : public ToolbarActionsModel::Observer {
   // from toolbar_actions_).
   ToolbarActionViewController* popup_owner_;
 
+  // The action that triggered the current sidebar (just a reference to an
+  // action from toolbar_actions_).
+  ToolbarActionViewController* sidebar_owner_;
+
   ScopedObserver<ToolbarActionsModel, ToolbarActionsModel::Observer>
       model_observer_;