RFR: 7080150: [TEST_BUG][macosx] No mac os x EmbeddedFrame support in regression regtesthelpers [v2]

[Alisen Chung]

> added EmbeddedFrame support for macosx in regtesthelpers

Alisen Chung has updated the pull request incrementally with two additional commits since the last revision:

 - Merge branch '7080150' of github.com:alisenchung/jdk into 7080150
 - fixed merge conflict

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/8348/files
  - new: https://git.openjdk.java.net/jdk/pull/8348/files/9570e351..39f6490b

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=8348&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=8348&range=00-01

  Stats: 0 lines in 0 files changed: 0 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8348.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8348/head:pull/8348

PR: https://git.openjdk.java.net/jdk/pull/8348