Make next collection group to update more deterministic

[wu-hui]

No description provided.

[google-oss-bot]

Coverage Report ¹

Affected Products

• firebase-firestore

  Overall coverage changed from 45.57% (cf15a6b) to 45.59% (4634ebe) by +0.01%.

  Filename	Base (cf15a6b)	Merge (4634ebe)	Diff
  PatchMutation.java	98.39%	100.00%	+1.61%
  SQLiteIndexManager.java	98.68%	98.69%	+0.01%

Test Logs

• Base (cf15a6b): https://android-ci.firebaseopensource.com/view/gcs/android-ci/logs/postsubmit-check-coverage/1496684869256744961
• Merge (4634ebe): https://android-ci.firebaseopensource.com/view/gcs/android-ci/pr-logs/pull/firebase_firebase-android-sdk/3484/check-coverage-changed/1496901438440214531

Notes

• Commit (4634ebe) is created by Prow via merging PR base commit (cf15a6b) and head commit (3aaa5e4).
• Run gradle <product>:checkCoverage to produce HTML coverage reports locally. After gradle commands finished, report files can be found under <product-build-dir>/reports/jacoco/.

1. https://storage.googleapis.com/firebase-sdk-metric-reports/VNITHtBM3w.html

[google-oss-bot]

Size Report ¹

Affected Products

• firebase-firestore

  Type	Base (cf15a6b)	Merge (93335b0)	Diff
  aar	1.24 MB	1.24 MB	+64 B (+0.0%)
  apk (release)	3.38 MB	3.38 MB	+100 B (+0.0%)

Test Logs

• Base (cf15a6b): https://android-ci.firebaseopensource.com/view/gcs/android-ci/logs/postsubmit-binary-size/1496684869256744962
• Merge (93335b0): https://android-ci.firebaseopensource.com/view/gcs/android-ci/pr-logs/pull/firebase_firebase-android-sdk/3484/binary-size/1496901210265882626

Notes

• Commit (93335b0) is created by Prow via merging PR base commit (cf15a6b) and head commit (56077ee).

1. https://storage.googleapis.com/firebase-sdk-metric-reports/EqKCmR3vAJ.html

[google-oss-bot]

@wu-hui: The following test failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
smoke-tests	3aaa5e4	link	/test smoke-tests

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