<AWT Dev> RFR: 8258788: incorrect response to change in window insets [lanai]

[Alexey Ushakov]

Dynamically change MTLLayer insets depending on FULL_WINDOW_CONTENT property. MTLLayer.h header cleanup.

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Commit messages:
 - 8258788: incorrect response to change in window insets [lanai]

Changes: https://git.openjdk.java.net/jdk/pull/3308/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3308&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8258788
  Stats: 31 lines in 7 files changed: 16 ins; 13 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3308.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3308/head:pull/3308

PR: https://git.openjdk.java.net/jdk/pull/3308