diff --git a/src/nw_shell.cc b/src/nw_shell.cc
index d72190b514..ef9a8032d6 100644
--- a/src/nw_shell.cc
+++ b/src/nw_shell.cc
@@ -718,4 +718,8 @@ void Shell::ToggleFullscreenModeForTab(WebContents* web_contents,
   window()->SetFullscreen(enter_fullscreen);
 }
 
+bool Shell::IsFullscreenForTabOrPending(const WebContents* web_contents) const {
+  return window()->IsFullscreen();
+}
+
 }  // namespace content
diff --git a/src/nw_shell.h b/src/nw_shell.h
index c38144214b..be01017f46 100644
--- a/src/nw_shell.h
+++ b/src/nw_shell.h
@@ -130,7 +130,7 @@ class Shell : public WebContentsDelegate,
   static int exit_code() { return exit_code_; }
 
   WebContents* web_contents() const { return web_contents_.get(); }
-  nw::NativeWindow* window() { return window_.get(); }
+  nw::NativeWindow* window() const { return window_.get(); }
 
   void set_force_close(bool force) { force_close_ = force; }
   bool is_devtools() const { return is_devtools_; }
@@ -167,6 +167,8 @@ class Shell : public WebContentsDelegate,
                                   WebContents* new_contents) OVERRIDE;
   virtual void ToggleFullscreenModeForTab(WebContents* web_contents,
                                           bool enter_fullscreen) OVERRIDE;
+  virtual bool IsFullscreenForTabOrPending(
+      const WebContents* web_contents) const OVERRIDE;
 #if defined(OS_WIN)
   virtual void WebContentsFocused(WebContents* contents) OVERRIDE;
 #endif