[9] Review request for 8044614: [macosx] Focus issue with 2 applets in firefox

[dmitry markov]

Hello,

Could you review the fix for jdk9, please?
    bug: https://bugs.openjdk.java.net/browse/JDK-8044614
    webrev: http://cr.openjdk.java.net/~dmarkov/8044614/jdk9/webrev.00/

Problem description: on Mac OSX when switching between several applets 
running in separate browser's windows, the applet in active window does 
not receive focus.
Fix: the method CEmbeddedFrame.handleWindowFocusEvent() should be 
modified. It has to detect the switching between browser's windows and 
update focusedWindow field accordingly.

Thanks,
Dmitry