md-input-element color should be currentColor, to match a transparent background

[jimitndiaye]

Bug, feature request, or proposal:

The default background is transparent. The default color should thus be current color in order for the input text to constrast properly. It is currently using the default value of initial but this causes problems when the background/foreground color changes. This is illustrated by @jelbourn 's https://github.com/jelbourn/material2-app (switch to dark mode and you'll see that the md-input's still have black text on a dark background)

What is the expected behavior?

Color should contrast correctly

What is the current behavior?

It retains the initial value and does not update dynamically.

What are the steps to reproduce?

Run https://github.com/jelbourn/material2-app and click on the Toggle Dark Theme button.

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Plunker template: http://plnkr.co/edit/o077B6uEiiIgkC0S06dd

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

Text should always be easily visible

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

Is there anything else we should know?

[jimitndiaye]

closed by #1262

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