VoiceOver does not recognize indeterminate progress status

[jelbourn]

When using VoiceOver on both progress-bar and process-circle, the screen-reader does not pick up the "indeterminate" state when mode is set to indeterminate. Instead, it simply reads "0 percent, progress indicator".

It does work for md-spinner, which sets the mode in the constructor, where it reads "indeterminate, progress indicator".

[jelbourn]

This should have been fixed by #640

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