Radio button, checkbox, and progress-bar issues in high contrast mode

[jelbourn]

• mat-radio-button: it looks like you can't see the selected state
• mat-checkbox: can't see the selected state in "High Contrast White"
• mat-progress-bar looks like it doesn't show the progress and is just a solid rectangle

[crisbeto]

@jelbourn when was the radio button issue reported? We merged in #10753 a while ago which still seems to work.