Add a <viewer-password-screen> element.

Add a <viewer-password-screen> element.

This element displays a password entry screen to collect a password from the
user. It fires a 'password' event when a password is entered. It exposes
accept() and deny() methods which can be called to indicate the password
was accepted or denied. It also exposes an 'active' attribute which specifies
whether or not the password screen is visible.

BUG=303491
R=ganetsky@chromium.org

Committed: 7c5a97b

[ganetsky1, 2014-02-20 20:18:16]

lgtm

https://codereview.chromium.org/169403008/diff/1/elements/viewer-password-scr...
File elements/viewer-password-screen/viewer-password-screen.html (right):

https://codereview.chromium.org/169403008/diff/1/elements/viewer-password-scr...
elements/viewer-password-screen/viewer-password-screen.html:51: if (this.active)
{
You can add arguments oldValue and newValue to the function and read those

[raymes, 2014-02-21 00:36:35]

On 2014/02/20 20:18:16, ganetsky1 wrote:
> lgtm
> 
>
https://codereview.chromium.org/169403008/diff/1/elements/viewer-password-scr...
> File elements/viewer-password-screen/viewer-password-screen.html (right):
> 
>
https://codereview.chromium.org/169403008/diff/1/elements/viewer-password-scr...
> elements/viewer-password-screen/viewer-password-screen.html:51: if
(this.active)
> {
> You can add arguments oldValue and newValue to the function and read those

In this case I only need the new value though, so "this.active" should be ok,
right?

[raymes, 2014-02-21 00:48:56]

Committed patchset #1 manually as r7c5a97b.