[Views] Allow dialog delegates to use a custom padding for the extra view

[Views] Allow dialog delegates to use a custom padding for the extra view

Add a new method to allow a DialogDelegate to provide a custom
amount to use as the minimum padding between the extra view and the
button strip in the dialog.
Use this to adjust the padding in the extension uninstall dialog.

BUG=441377
Committed: https://crrev.com/90ad13a3b73ceda1500ab42de3d628ef851c2daa
Cr-Commit-Position: refs/heads/master@{#330622}

[Devlin, 2015-05-15 18:17:00]

Patchset #1 (id:1) has been deleted

[Devlin, 2015-05-15 18:19:04]

rdevlin.cronin@chromium.org changed reviewers:
+ sky@chromium.org

[Devlin, 2015-05-15 18:20:57]

Hey Scott - UI review wanted the padding between an extra view checkbox and the
buttons to be a bit larger on the extension uninstall dialog.  Lemme know if
you'd prefer a different approach.

Cheers!

[sky, 2015-05-18 17:08:47]

Did you make sure they don't want the extra padding every where?

[Devlin, 2015-05-19 15:53:33]

On 2015/05/18 17:08:47, sky wrote:
> Did you make sure they don't want the extra padding every where?

Yeah, the CreateExtraView() method is (presumably intentionally) flexible, so it
means a lot of different things to a lot of different dialogs, some of which
already do their own special layout management for it.  Changing this as the
default would have some pretty far-reaching changes, which UI wouldn't be
comfortable with without an individual audit of each case.  (I think there are
around a dozen different dialogs that do it.)

[sky, 2015-05-19 19:48:46]

LGTM

[Devlin, 2015-05-19 20:53:26]

The CQ bit was checked by rdevlin.cronin@chromium.org

[commit-bot: I haz the power, 2015-05-19 20:53:40]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1141253002/20001

[commit-bot: I haz the power, 2015-05-19 21:53:35]

Committed patchset #1 (id:20001)

[commit-bot: I haz the power, 2015-05-19 21:55:17]

Patchset 1 (id:??) landed as
https://crrev.com/90ad13a3b73ceda1500ab42de3d628ef851c2daa
Cr-Commit-Position: refs/heads/master@{#330622}