Movie client-side popup origin validation to _after_ popup is opened

[sam-gc]

Popups should open as quickly as possible after being triggered by a user action. This change moves the origin validation stage to after the popup is opened, to prevent latency between user action and the popup. See this discussion: #4432

[google-oss-bot]

Binary Size Report

Affected SDKs

No changes between base commit (39a8be6) and head commit (173e52a).

Test Logs

• Base (39a8be6f): https://github.com/firebase/firebase-js-sdk/actions/runs/594300496
• Head (173e52a0): https://github.com/firebase/firebase-js-sdk/actions/runs/594381114

[google-oss-bot]

Size Analysis Report

Affected Products

• @firebase/auth-exp

  • getAuth

    Size Table

    Type	Base (08e2aa3)	Head (2fdd85e)	Diff
    size	55.6 kB	55.6 kB	-29 B (-0.1%)
    size-with-ext-deps	66.6 kB	66.6 kB	-29 B (-0.0%)

  • linkWithPopup

    Size Table

    Type	Base (08e2aa3)	Head (2fdd85e)	Diff
    size	36.9 kB	37.0 kB	+72 B (+0.2%)
    size-with-ext-deps	47.6 kB	47.7 kB	+72 B (+0.2%)

  • reauthenticateWithPopup

    Size Table

    Type	Base (08e2aa3)	Head (2fdd85e)	Diff
    size	36.9 kB	37.0 kB	+72 B (+0.2%)
    size-with-ext-deps	47.6 kB	47.7 kB	+72 B (+0.2%)

  • signInWithPopup

    Size Table

    Type	Base (08e2aa3)	Head (2fdd85e)	Diff
    size	36.9 kB	37.0 kB	+72 B (+0.2%)
    size-with-ext-deps	47.6 kB	47.7 kB	+72 B (+0.2%)

  • browserPopupRedirectResolver

    Size Table

    Type	Base (08e2aa3)	Head (2fdd85e)	Diff
    size	45.3 kB	45.3 kB	-29 B (-0.1%)
    size-with-ext-deps	56.2 kB	56.1 kB	-29 B (-0.1%)

Test Logs

• Base (08e2aa3): https://github.com/firebase/firebase-js-sdk/actions/runs/593851265
• Head (2fdd85e): https://github.com/firebase/firebase-js-sdk/actions/runs/594013020