add config to stop matdialog closing when browser back button is pressed

[spencerodai]

Bug, feature request, or proposal:

feature request

What is the expected behavior?

allow a config that can be set to enable/ disable location back button pressed from closing all dialog.

What is the current behavior?

when the back button on a browser is pressed the dialog with the form closes anyway disregarding my guard.

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

I have a dialog with a form and deactivate guard that will open another dialog and prompt user about progressing or quitting. when the back button on a browser is pressed the dialog with the form closes anyway disregarding my guard.

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

"@angular/core": "^5.0.3",
"@angular/forms": "^5.0.3",
"@angular/http": "^5.0.3",
"@angular/material": "^5.0.0-rc.1"

Is there anything else we should know?

NA

[spencerodai]

Hi @jelbourn , any progress with this? thanks

[crisbeto]

Closing as a dupe of #8983.

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