fix(toolbar): improved high contrast accessibility (#10465)
fix(toolbar): improved high contrast accessibility (#10465)

Currently the toolbar blends into the background for users in high contrast mode. These changes add an outline to make it stand out.
mmalerba/material2,crisbeto/material2,angular/components,jelbourn/material2,jelbourn/material2,mmalerba/material2,Jefiozie/material2,josephperrott/material2,mmalerba/material2,mmalerba/material2,ppham27/material2,mmalerba/material2,andrewseguin/material2,andrewseguin/material2,Jefiozie/material2,DevVersion/material2,amcdnl/material2,amcdnl/material2,josephperrott/material2,amcdnl/material2,josephperrott/material2,crisbeto/material2,DevVersion/material2,DevVersion/material2,josephperrott/material2,andrewseguin/material2,crisbeto/material2,andrewseguin/material2,angular/components,Jefiozie/material2,ppham27/material2,jelbourn/material2,DevVersion/material2,amcdnl/material2,ppham27/material2,jelbourn/material2,amcdnl/material2,Jefiozie/material2,andrewseguin/material2,DevVersion/material2,ppham27/material2,jelbourn/material2,ppham27/material2,josephperrott/material2,Jefiozie/material2,angular/components,crisbeto/material2,angular/components