Expose entireWord in updateFindControlState

[bootleq]

This is a request to additionally expose entireWord state in updateFindControlState.

Have a use case

I am studying Firefox findbar behavior when viewing PDF, especially the "not found" sound. The condition of the sound requires to consider whether entireWord is checked. See related implementation in https://hg.mozilla.org/mozilla-central/rev/16b902cbcf26

This PR would help if I move the implementation from cpp to jsm.

[Snuffleupagus]

/botio test

[moz-tools-bot]

From: Bot.io (Windows)

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Received

Command cmd_test from @Snuffleupagus received. Current queue size: 0

Live output at: http://54.193.163.58:8877/13a29b0a0c35890/output.txt

[moz-tools-bot]

From: Bot.io (Linux m4)

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Received

Command cmd_test from @Snuffleupagus received. Current queue size: 0

Live output at: http://54.241.84.105:8877/959293c25a66bbf/output.txt

[moz-tools-bot]

From: Bot.io (Linux m4)

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Failed

Full output at http://54.241.84.105:8877/959293c25a66bbf/output.txt

Total script time: 28.72 mins

• Unit tests: Passed
• Integration Tests: Passed
• Regression tests: FAILED

  different ref/snapshot: 14
  different first/second rendering: 1

Image differences available at: http://54.241.84.105:8877/959293c25a66bbf/reftest-analyzer.html#web=eq.log

[moz-tools-bot]

From: Bot.io (Windows)

---

Failed

Full output at http://54.193.163.58:8877/13a29b0a0c35890/output.txt

Total script time: 44.18 mins

• Unit tests: Passed
• Integration Tests: FAILED
• Regression tests: FAILED

  different ref/snapshot: 5

Image differences available at: http://54.193.163.58:8877/13a29b0a0c35890/reftest-analyzer.html#web=eq.log

[Snuffleupagus]

Please squash the commits, since we don't use separate fixup commits in this project.

[timvandermeij]

Looks good to me too, especially with the added test. Thank you!