Provide way to set focus target when opening dialog

[tuckerjt07]

Bug, feature request, or proposal:

For dialogs with titles do not force focus onto the title cancel button (usually an X icon button in the right section of the title area). Or can we have this so that we can manually override.

What is the expected behavior?

Focus the first non-button input instead

What is the current behavior?

The cancel button is focused.

What are the steps to reproduce?

Create a custom dialog with a button as the first input HTML element in the document.

Providing a Plunker (or similar) is the best way to get the team to see your issue.
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What is the use-case or motivation for changing an existing behavior?

I understand the use case, especially around accessibility issues, but it would provide a better experience in this case not to have it.

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

Is there anything else we should know?

[jelbourn]

The real feature needed here is the ability to set the focus target should be for dialog open.

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