hg: jdk/client: 8181910: [macos] Support dark title bars on macOS

[ajit.ghaisas at oracle.com]

Changeset: ecc7b10a1cca
Author:    sveerabhadra
Date:      2018-04-16 10:35 +0530
URL:       http://hg.openjdk.java.net/jdk/client/rev/ecc7b10a1cca

8181910: [macos] Support dark title bars on macOS
Reviewed-by: serb, denis

! src/java.desktop/macosx/classes/sun/lwawt/macosx/CPlatformWindow.java
! src/java.desktop/macosx/native/libawt_lwawt/awt/AWTWindow.m
+ test/jdk/javax/swing/JFrame/DarkTitleBar/DarkTitleBar.java