Sidenav: mat-sidenav-content margins not updated when dir changed

[langan]

Bug, feature request, or proposal:

Bug: mat-sidenav-content margins are not updated when text direction changes

What is the expected behavior?

When you switch to RTL or back to LTR the margins of mat-sidenav-content should be recalculates.

What is the current behavior?

When you change the text direction to RTL mat-sidenav-content keeps the LTR margins

What are the steps to reproduce?

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

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

Switching from LTR / RTL shouldn't require a reload of the page.

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

Angular: 5.0.0
Angular Material: 5.0.2

Is there anything else we should know?

Looking at this line https://github.com/angular/material2/blob/c3d7cd96de6f06e1530658e41d1e8aa3ba74805e/src/lib/sidenav/drawer.ts#L493 maybe we should also call _updateContentMargins ?

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