Implement a Menu Item to Hide the Toolbar in Fullscreen

chrome/test/base/test_browser_window.h

Index: chrome/test/base/test_browser_window.h
diff --git a/chrome/test/base/test_browser_window.h b/chrome/test/base/test_browser_window.h
index 4e8bf4f55b4598fb3ba61124a6fd4ac9e5466985..bc51ab742b980f6dd9e1fafab27f56b77bfe20db 100644
--- a/chrome/test/base/test_browser_window.h
+++ b/chrome/test/base/test_browser_window.h
@@ -72,9 +72,10 @@ class TestBrowserWindow : public BrowserWindow {
   bool ShouldHideUIForFullscreen() const override;
   bool IsFullscreen() const override;
   bool IsFullscreenBubbleVisible() const override;
-  bool SupportsFullscreenWithToolbar() const override;
   void UpdateFullscreenWithToolbar(bool with_toolbar) override;
+  void ToggleFullscreenToolbar() override;
   bool IsFullscreenWithToolbar() const override;
+  bool ShouldHideFullscreenToolbar() const override;
 #if defined(OS_WIN)
   void SetMetroSnapMode(bool enable) override {}
   bool IsInMetroSnapMode() const override;