<md-input> placeholders are not working on the pink-bluegrey theme.

[alxhub]

Bug, feature request, or proposal:

Bug report.

What is the expected behavior?

Placeholders show up on <md-input> when using the pink-bluegrey theme.

What is the current behavior?

Placeholder text is white until the <md-input> is focused.

What are the steps to reproduce?

http://plnkr.co/edit/qjcghUoBEs0GMING1eS9?p=preview

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

Alpha 10, Chrome 54

[crisbeto]

This due to it being a dark theme, but we don't actually apply the theme background to the body, we only have it on the md-sidenav-layout (which we use in the demo app). @jelbourn should I add the theme background to the body?

[jelbourn]

@crisbeto Nope. We shouldn't change the styles of any elements not owned by a component. This should probably just be something that goes into the theming guide.

[crisbeto]

Wouldn't this be a pretty common use case? I'd imagine that not everybody will use md-sidenav-layout as their main wrapper element.

[jelbourn]

Potentially, but I want to stick to that policy for now and try to address this with documentation.

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