Directionality is not implemented for dir="auto"

[philip-firstorder]

Bug, feature request, or proposal:

Need to implement auto directionality so that the direction can be determined by the text language.

What is the expected behavior?

• sushi text should be aligned to the left because dir="auto is used on the input
• Leave a comment placeholder should align to the left because dir="auto" was used on its entire form-field, which would include labels, errors, hints, icon etc.

What is the current behavior?

All controls and values inherit the dir="rtl" value from the container form.

What are the steps to reproduce?

https://stackblitz.com/edit/angular-pvwfjq?file=app/input-overview-example.html

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

To implement native dir="auto".

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

"@angular/cdk": "^5.2.3",
"@angular/material": "^5.2.3",

Is there anything else we should know?

[crisbeto]

We've got a TODO for it here. The issue is that in order for us to know what the value is, we have to do a getComputedStyle call which can be expensive.

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