Add GCE JCasC (bp #1053)

[mergify]

This is an automatic backport of pull request #1053 done by Mergify.

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[apmmachine]

💚 Build Succeeded

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Build stats

• Build Cause: Pull request #1056 opened

• Start Time: 2021-03-26T13:55:02.522+0000

• Duration: 31 min 33 sec

• Commit: f4b2612

Test stats 🧪

Test	Results
Failed	0
Passed	1039
Skipped	2
Total	1041

Trends 🧪

💚 Flaky test report

Tests succeeded.

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Test stats 🧪

Test	Results
Failed	0
Passed	1039
Skipped	2
Total	1041