Add update transforms proto

[thebrianchen]

Porting from web.

[google-oss-bot]

Coverage Report

Affected SDKs

• firebase-firestore

  SDK overall coverage changed from 46.85% (00e6a8d) to 46.69% (aeb1fd21) by -0.16%.

  Filename	Base (00e6a8d)	Head (aeb1fd21)	Diff
  Write.java	37.89%	30.63%	-7.27%

Test Logs

• Base (00e6a8d5): https://android-ci.firebaseopensource.com/view/gcs/android-ci/logs/postsubmit-check-coverage/1334171850921480196
• Head (aeb1fd21): https://android-ci.firebaseopensource.com/view/gcs/android-ci/pr-logs/pull/firebase_firebase-android-sdk/2224/check-coverage-changed/1334272891277021189

Notes

HTML coverage reports can be produced locally with ./gradlew <product>:checkCoverage.
Report files are located at <product-build-dir>/reports/jacoco/.

Head commit (aeb1fd21) is created by Prow via merging commits: 00e6a8d c1e0497.

[google-oss-bot]

Binary Size Report

Affected SDKs

• firebase-firestore

  Type	Base (00e6a8d)	Head (aeb1fd21)	Diff
  aar	998 kB	1.00 MB	+1.78 kB (+0.2%)
  apk (release)	3.15 MB	3.15 MB	+1.27 kB (+0.0%)

Test Logs

• Base (00e6a8d5): https://android-ci.firebaseopensource.com/view/gcs/android-ci/logs/postsubmit-binary-size/1334171850921480195
• Head (aeb1fd21): https://android-ci.firebaseopensource.com/view/gcs/android-ci/pr-logs/pull/firebase_firebase-android-sdk/2224/binary-size/1334272891277021188

Notes

Head commit (aeb1fd21) is created by Prow via merging commits: 00e6a8d c1e0497.

[google-oss-bot]

@thebrianchen: The following test failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
smoke-tests	c1e0497	link	/test smoke-tests

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