Backport readTime changes

[schmidt-sebastian]

Backporting some of the changes in firebase/firebase-js-sdk#5925 that were not already part of Android.

[google-oss-bot]

Coverage Report ¹

Affected Products

• firebase-firestore

  Overall coverage changed from 45.35% (d1fc101) to 45.34% (66aaef9) by -0.01%.

  Filename	Base (d1fc101)	Merge (66aaef9)	Diff
  DocumentKey.java	100.00%	97.14%	-2.86%
  LocalStore.java	99.37%	99.35%	-0.01%
  PatchMutation.java	100.00%	98.39%	-1.61%
  SetMutation.java	97.14%	94.29%	-2.86%
  WatchChangeAggregator.java	98.18%	98.21%	+0.03%

Test Logs

• Base (d1fc101): https://android-ci.firebaseopensource.com/view/gcs/android-ci/logs/postsubmit-check-coverage/1487184008411353088
• Merge (66aaef9): https://android-ci.firebaseopensource.com/view/gcs/android-ci/pr-logs/pull/firebase_firebase-android-sdk/3378/check-coverage-changed/1487194295512338445

Notes

• Commit (66aaef9) is created by Prow via merging PR base commit (d1fc101) and head commit (686c4b3).
• 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/b1wVN31w0h.html

[google-oss-bot]

Size Report ¹

Affected Products

• firebase-firestore

  Type	Base (d1fc101)	Merge (66aaef9)	Diff
  aar	1.24 MB	1.24 MB	-49 B (-0.0%)
  apk (release)	3.33 MB	3.33 MB	-240 B (-0.0%)

Test Logs

• Base (d1fc101): https://android-ci.firebaseopensource.com/view/gcs/android-ci/logs/postsubmit-binary-size/1487184008411353089
• Merge (66aaef9): https://android-ci.firebaseopensource.com/view/gcs/android-ci/pr-logs/pull/firebase_firebase-android-sdk/3378/binary-size/1487194295512338443

Notes

• Commit (66aaef9) is created by Prow via merging PR base commit (d1fc101) and head commit (686c4b3).

1. https://storage.googleapis.com/firebase-sdk-metric-reports/yt3YanxX1u.html

[google-oss-bot]

@schmidt-sebastian: The following test failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
smoke-tests	686c4b3	link	/test smoke-tests

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