MatButton.focus ignores origin argument

[paulferaud]

MatButton implements FocusableOption which implements focus(origin?: FocusOrigin). However, it actually implements just focus(unused, extraArgumentsHere).

Reproduction

Use StackBlitz to reproduce your issue: https://stackblitz.com/edit/angular-qrhvfh

Steps to reproduce:

1. Get reference to MatButton
2. Call MatButton.focus(origin) where origin = 'keyboard'|'mouse'|whatever

Expected Behavior

Focus should be via 'origin', and class cdk-origin-focused should be applied

Actual Behavior

Focus is always done via 'program' and cdk-program-focused is applied

Workaround

Focus can be done via FocusMonitor instead.

Environment

• Angular: 7.0.0
• CDK/Material: 8.1.4
• Browser(s): Version 77.0.3865.75 (Official Build) (64-bit)
• Operating System (e.g. Windows, macOS, Ubuntu): Debian Rodette

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