RFR: JDK-8340332 : Open source mixed AWT tests - Set3

[Harshitha Onkar]

Following tests are open-sourced in this PR:

1. /java/awt/MouseInfo/ContainerResizeMousePositionTest.java - Automated
2. [LINUX ONLY] /java/awt/color/XAWTDifference/XAWTDifference.java - Manual PFJ test

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Commit messages:
 - mixed awt tests

Changes: https://git.openjdk.org/jdk/pull/21271/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21271&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8340332
  Stats: 361 lines in 3 files changed: 361 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/21271.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21271/head:pull/21271

PR: https://git.openjdk.org/jdk/pull/21271