Add FirebaseFunctions.getHttpsCallableFromURL

[inlined]

Sorry for a late-coming urgent change; AFAICT nobody on the SDK team could staff these changes, so I'm trying to write the change for the top 3 SDKs before I/O freeze.

For context, see go/cf3v2-crash-landing.
For API approval, see go/callable-functions-custom-urls

[google-oss-bot]

Coverage Report ¹

Affected Products

• firebase-functions

  Overall coverage changed from ? (2cbed1d) to 3.43% (9f58315) by ?.

  11 individual files with coverage change

  Filename	Base (2cbed1d)	Merge (9f58315)	Diff
  ContextProvider.java	?	0.00%	?
  FirebaseContextProvider.java	?	0.00%	?
  FirebaseFunctions.java	?	0.00%	?
  FirebaseFunctionsException.java	?	0.00%	?
  FunctionsMultiResourceComponent.java	?	0.00%	?
  FunctionsRegistrar.java	?	65.22%	?
  HttpsCallableContext.java	?	0.00%	?
  HttpsCallableReference.java	?	0.00%	?
  HttpsCallableResult.java	?	0.00%	?
  HttpsCallOptions.java	?	0.00%	?
  Serializer.java	?	0.00%	?

Test Logs

• Merge (9f58315): https://android-ci.firebaseopensource.com/view/gcs/android-ci/pr-logs/pull/firebase_firebase-android-sdk/3659/check-coverage-changed/1516441080864706562

Notes

• Commit (9f58315) is created by Prow via merging PR base commit (2cbed1d) and head commit (4b173f8).
• 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/qJY0pQQmuz.html

[google-oss-bot]

The public api surface has changed for the subproject firebase-functions:
error: Added method com.google.firebase.functions.FirebaseFunctions.getHttpsCallableFromUrl(String) [AddedMethod]

Please update the api.txt files for the subprojects being affected by this change by running ./gradlew ${subproject}:generateApiTxtFile. Also perform a major/minor bump accordingly.

[google-oss-bot]

Size Report ¹

Affected Products

• firebase-functions

  Type	Base (2cbed1d)	Merge (9f58315)	Diff
  aar	25.8 kB	26.1 kB	+363 B (+1.4%)
  apk (release)	1.21 MB	1.21 MB	+432 B (+0.0%)

Test Logs

• Base (2cbed1d): https://android-ci.firebaseopensource.com/view/gcs/android-ci/logs/postsubmit-binary-size/1516439067431014405
• Merge (9f58315): https://android-ci.firebaseopensource.com/view/gcs/android-ci/pr-logs/pull/firebase_firebase-android-sdk/3659/binary-size/1516441080868900869

Notes

• Commit (9f58315) is created by Prow via merging PR base commit (2cbed1d) and head commit (4b173f8).

1. https://storage.googleapis.com/firebase-sdk-metric-reports/MKB0wSSPYA.html

[google-oss-bot]

The public api surface has changed for the subproject firebase-functions:
error: Removed method com.google.firebase.functions.FirebaseFunctions.getHttpsCallableFromUrl(URL) [RemovedMethod]
error: Added method com.google.firebase.functions.FirebaseFunctions.getHttpsCallableFromUrl(java.net.URL) [AddedMethod]

Please update the api.txt files for the subprojects being affected by this change by running ./gradlew ${subproject}:generateApiTxtFile. Also perform a major/minor bump accordingly.

[inlined]

/test check-changed