Support restart of FirestoreClient #12820

Job	Run time
Build Firestore	9m 12s
Test Firestore Compatible	5m 4s
Test Firestore Compatible on Firefox	6m 31s
Test Firestore on Firefox (test:browser)	10m 2s
Test Firestore (test:browser)	8m 17s
Test Firestore on Firefox (test:travis)	4m 2s
Test Firestore (test:travis)	4m 3s
Test Firestore on Firefox (test:lite:browser)	1m 41s
Test Firestore (test:lite:browser)	1m 29s
Test Nightly Firestore with Chrome	0s
Test Firestore (test:browser:prod:nameddb)	9m 13s
Test Firestore on Firefox (test:browser:prod:nameddb)	10m 5s
Test Firestore on Firefox (test:lite:browser:nameddb)	1m 44s
Test Firestore (test:lite:browser:nameddb)	1m 21s
Check all required tests results	1s
	1h 12m 45s

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