fix(clock): ensure Date.now() is an integer

[pavelfeldman]

Fixes #31644

[github-actions]

Test results for "tests 1"

9 flaky

⚠️ [chromium-library] › library/browsercontext-fetch-happy-eyeballs.spec.ts:49:3 › get should work on request fixture
⚠️ [chromium-library] › library/browsercontext-fetch-happy-eyeballs.spec.ts:49:3 › get should work on request fixture
⚠️ [chromium-library] › library/browsercontext-fetch-happy-eyeballs.spec.ts:49:3 › get should work on request fixture
⚠️ [firefox-library] › library/browsercontext-fetch-happy-eyeballs.spec.ts:49:3 › get should work on request fixture
⚠️ [chromium-library] › library/browsercontext-fetch-happy-eyeballs.spec.ts:49:3 › get should work on request fixture
⚠️ [chromium-library] › library/capabilities.spec.ts:137:3 › should not crash on showDirectoryPicker
⚠️ [chromium-library] › library/inspector/cli-codegen-1.spec.ts:23:7 › cli codegen › should click
⚠️ [webkit-library] › library/browsercontext-fetch-happy-eyeballs.spec.ts:49:3 › get should work on request fixture
⚠️ [webkit-library] › library/browsercontext-reuse.spec.ts:50:1 › should reset serviceworker

28838 passed, 708 skipped
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Merge workflow run.