Implement sidebar support for extension action popups

chrome/browser/ui/cocoa/browser_window_controller.h

Index: chrome/browser/ui/cocoa/browser_window_controller.h
diff --git a/chrome/browser/ui/cocoa/browser_window_controller.h b/chrome/browser/ui/cocoa/browser_window_controller.h
index 1597b0f3fc3106a4c1c63734bd5a0ba68b9f1c41..00ff8824787067aa9e459f5f08eed99e4ad1b302 100644
--- a/chrome/browser/ui/cocoa/browser_window_controller.h
+++ b/chrome/browser/ui/cocoa/browser_window_controller.h
@@ -44,6 +44,7 @@ class LocationBarViewMac;
 @class OverlayableContentsController;
 class PermissionBubbleCocoa;
 @class PresentationModeController;
+@class SidebarController;
 class StatusBubbleMac;
 @class TabStripController;
 @class TabStripView;
@@ -87,6 +88,8 @@ class Command;
   base::scoped_nsobject<BrowserWindowEnterFullscreenTransition>
       enterFullscreenTransition_;
 
+  base::scoped_nsobject<SidebarController> sidebarController_;
+
   // Strong. StatusBubble is a special case of a strong reference that
   // we don't wrap in a scoped_ptr because it is acting the same
   // as an NSWindowController in that it wraps a window that must
@@ -345,6 +348,10 @@ class Command;
 // Shows or hides the docked web inspector depending on |contents|'s state.
 - (void)updateDevToolsForContents:(content::WebContents*)contents;
 
+// Displays the active sidebar linked to the |contents| or hides sidebar UI,
+// if there's no such sidebar.
+- (void)updateSidebarForContents:(content::WebContents*)contents;
+
 // Gets the current theme provider.
 - (ui::ThemeProvider*)themeProvider;