RFR: 8248301: Lanai - Change MTLStorageMode of MTLSurfaceData texture (render backbuffer) to private [v2]

[Ajit Ghaisas]

> Issue : https://bugs.openjdk.java.net/browse/JDK-8248301
> More details on JBS.

Ajit Ghaisas has updated the pull request incrementally with one additional commit since the last revision:

  misc err fixes

-------------

Changes:
  - all: https://git.openjdk.java.net/lanai/pull/60/files
  - new: https://git.openjdk.java.net/lanai/pull/60/files/f8ea9a8d..67162d7c

Webrevs:
 - full: https://webrevs.openjdk.java.net/lanai/60/webrev.01
 - incr: https://webrevs.openjdk.java.net/lanai/60/webrev.00-01

  Stats: 2 lines in 1 file changed: 0 ins; 1 del; 1 mod
  Patch: https://git.openjdk.java.net/lanai/pull/60.diff
  Fetch: git fetch https://git.openjdk.java.net/lanai pull/60/head:pull/60

PR: https://git.openjdk.java.net/lanai/pull/60