RFR: 8242163: Android keyboard integration fails

[Johan Vos]

Fix the code that integrates TextField/TextArea with the android keyboard

Fix for #8242163

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Commit messages:
 - Fix the code that integrates TextField/TextArea with the android keyboard

Changes: https://git.openjdk.java.net/jfx/pull/157/files
 Webrev: https://webrevs.openjdk.java.net/jfx/157/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8242163
  Stats: 267 lines in 9 files changed: 148 ins; 108 del; 11 mod
  Patch: https://git.openjdk.java.net/jfx/pull/157.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/157/head:pull/157

PR: https://git.openjdk.java.net/jfx/pull/157