Linux Aura: Hide title bar when CustomFrameView maximized on Unity.

ui/views/views_delegate.h

Index: ui/views/views_delegate.h
diff --git a/ui/views/views_delegate.h b/ui/views/views_delegate.h
index 9ae48eecd3f2913786b456b1a916c39d3b273542..a3d63bd3f99b8523426f76f8ca2760b67fbaf70d 100644
--- a/ui/views/views_delegate.h
+++ b/ui/views/views_delegate.h
@@ -119,6 +119,12 @@ class VIEWS_EXPORT ViewsDelegate {
   // Returns the default obscured text reveal duration.
   virtual base::TimeDelta GetDefaultTextfieldObscuredRevealDuration() = 0;
 
+  // Returns true if the operating system's window manager will always provide a
+  // title bar with caption buttons (ignoring the setting to
+  // |remove_standard_frame| in InitParams). If |maximized|, this applies to
+  // maximized windows; otherwise to restored windows.
+  virtual bool WindowManagerProvidesTitleBar(bool maximized);
+
  private:
   scoped_ptr<ViewsTouchSelectionControllerFactory> views_tsc_factory_;
 };