RFR: 8274346: Support for additional content in an app-image.

[Andy Herrick]

8274346: Support for additional content in an app-image.

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Commit messages:
 - JDK-8274346: Support for additional content in an app-image.
 - JDK-8274346: Support for additional content in an app-image.
 - JDK-8274346: Support for additional content in an app-image.

Changes: https://git.openjdk.java.net/jdk/pull/5780/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5780&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8274346
  Stats: 168 lines in 10 files changed: 158 ins; 0 del; 10 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5780.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5780/head:pull/5780

PR: https://git.openjdk.java.net/jdk/pull/5780