Setting mode of MatProgressSpinner asynchronously doesn't work in Safari

[farley911]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

After setting the mode the spinner should show the correct value.

What is the current behavior?

Changing the mode from "indeterminate" to "determinate" after the view has been rendered results in the spinner rendering with an incorrect value. (Safari only)

What are the steps to reproduce?

https://stackblitz.com/edit/angular-bqxnwh

What is the use-case or motivation for changing an existing behavior?

The behavior should be consistent across browsers.

Which versions of Angular, Material, OS, TypeScript, browsers are affected?

Material 6

Is there anything else we should know?

[angular-automatic-lock-bot]

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