[7u10] Review request for 7172187 [macosx] JAWT native CALayer not positioned over Canvas

[Sergey Bylokhov]

Hi Everyone,
Please review the fix. This is direct backport from jdk 8.

Description of main changes:

CPlatformComponent.java:
     -Unused peer and target references were removed.
     -Wrong return value for nativeSetBounds() was changed from long to 
void.
AWTSurfaceLayers.m:
     -layer.bounds was replaced by layer.frame, because layer.bounds 
doesn't honour x and y position of the layer.
     -Wrong position inversion was removed.
Also related fields were marked as volatile, if they were used in the 
different threads + javadoc cleanup.

Bug: http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=7172187
Webrev can be found at: http://cr.openjdk.java.net/~serb/7172187/webrev.00
jdk8 changeset: http://hg.openjdk.java.net/jdk8/awt/jdk/rev/65d874d16d59

-- 
Best regards, Sergey.