sun.lwawt.macosx.CEmbeddedFrame is a lightweight, CALayer-based implementation of sun.awt.EmbeddedFrame to embed AWT/Swing applets to browser. However, This is not the only case where embedded frames are used, for example, SWT utilizes it for SWT_AWT bridge.
In JDK6, Apple provided NSView-based (heavyweight) subclass of sun.awt.EmbeddedFrame, and this is what SWT expects from JDK7 as well. So we'll need one more implementation. Note that it will unlikely be named exactly as in JDK6 (apple.awt.CEmbeddedFrame), so some code changes in SWT will be required too.