Add support for Optional Content in TilingPatterns (issue 15716)

[Snuffleupagus]

This can't be a particularly common feature, since we've supported Optional Content for over two years and this is the very first TilingPattern-case we've seen.

[Snuffleupagus]

/botio test

[pdfjsbot]

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/ecdee9dd8cce185/output.txt

[pdfjsbot]

From: Bot.io (Windows)

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Received

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

Live output at: http://54.193.163.58:8877/0fa39273cb30699/output.txt

[pdfjsbot]

From: Bot.io (Linux m4)

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Failed

Full output at http://54.241.84.105:8877/ecdee9dd8cce185/output.txt

Total script time: 25.49 mins

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

  different ref/snapshot: 10
  different first/second rendering: 1

Image differences available at: http://54.241.84.105:8877/ecdee9dd8cce185/reftest-analyzer.html#web=eq.log

[pdfjsbot]

From: Bot.io (Windows)

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Failed

Full output at http://54.193.163.58:8877/0fa39273cb30699/output.txt

Total script time: 34.39 mins

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

  different ref/snapshot: 12

Image differences available at: http://54.193.163.58:8877/0fa39273cb30699/reftest-analyzer.html#web=eq.log

[calixteman]

LGTM.

[Snuffleupagus]

/botio makeref

[pdfjsbot]

From: Bot.io (Linux m4)

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Received

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

Live output at: http://54.241.84.105:8877/d68680e10d946cb/output.txt

[pdfjsbot]

From: Bot.io (Windows)

---

Received

Command cmd_makeref from @Snuffleupagus received. Current queue size: 1

Live output at: http://54.193.163.58:8877/73347a0f2b5e6dc/output.txt

[pdfjsbot]

From: Bot.io (Linux m4)

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Success

Full output at http://54.241.84.105:8877/d68680e10d946cb/output.txt

Total script time: 21.60 mins

• Lint: Passed
• Make references: Passed
• Check references: Passed

[pdfjsbot]

From: Bot.io (Windows)

---

Success

Full output at http://54.193.163.58:8877/73347a0f2b5e6dc/output.txt

Total script time: 25.01 mins

• Lint: Passed
• Make references: Passed
• Check references: Passed