<AWT Dev> RFR: 8253681: closed java/awt/dnd/MouseEventAfterStartDragTest/MouseEventAfterStartDragTest.html test failed

[Sergey Bylokhov]

The "discardingMouseEvents" flag in the SunDragSourceContextPeer class is used on the different threads without any
synchronization.

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Commit messages:
 - Update SunDragSourceContextPeer.java

Changes: https://git.openjdk.java.net/jdk/pull/491/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=491&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8253681
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/491.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/491/head:pull/491

PR: https://git.openjdk.java.net/jdk/pull/491