RFR: 8169468: NoResizeEventOnDMChangeTest.java fails because FS Window didn't receive all resizes!

[Alexander Zuev]

I was able to reproduce this issue locally 2 times out of 100 runs on multi-monitor
configuration. Both times due to the screen resolution change is so slow window got
accidentally moved to the secondary screen by the display driver.
Can not reproduce this bug with ATI card at all.
Since there is nothing we can do to stop graphics driver from reassigning
the window if it decides that promary monitor is not on at the moment the
only way is to check if this has had happened and if so then we can not trust the test
since we changing resolution of one display and window not getting resized
because it is placed on another display and test should be skept.

After that i ran this test locally about a thousand times on all platforms
and has not seen the failure again.

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Commit messages:
 - 8169468: NoResizeEventOnDMChangeTest.java fails because FS Window didn't receive all resizes!

Changes: https://git.openjdk.java.net/jdk/pull/6186/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6186&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8169468
  Stats: 26 lines in 2 files changed: 20 ins; 2 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6186.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6186/head:pull/6186

PR: https://git.openjdk.java.net/jdk/pull/6186