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

ui/views/window/custom_frame_view.h

Index: ui/views/window/custom_frame_view.h
diff --git a/ui/views/window/custom_frame_view.h b/ui/views/window/custom_frame_view.h
index 8c96df7fc9f7a79fd2669ab2643839cfedfa9774..96dbd225c19307a819ce6b140318f39a13b83f4b 100644
--- a/ui/views/window/custom_frame_view.h
+++ b/ui/views/window/custom_frame_view.h
@@ -86,6 +86,10 @@ class CustomFrameView : public NonClientFrameView,
   // there was one).
   gfx::Rect IconBounds() const;
 
+  // Returns true if the title bar, caption buttons, and frame border should be
+  // drawn. If false, the client view occupies the full area of this view.
+  bool ShouldShowTitleBarAndBorder() const;
+
   // Returns true if the client edge should be drawn. This is true if
   // the window is not maximized.
   bool ShouldShowClientEdge() const;