Add new button assets and IDRs.

Add new button assets and IDRs.

The new assets and IDRs will be used for:
-Checkbox images in various states.
-RadioButton images in various states.
-LabelButton STYLE_BUTTON STATE_DISABLED images.

I compressed the assets with the 'aggressive' setting:
$ build/sanitize-png-files.sh -o2 ~/Chrome/Buttons/new-assets/
...
Processed 70 files (out of 70 files) in 00:03:47s
Result : 40115 => 28059 bytes (12056 bytes : 30 %)

BUG=242707
TEST=NONE
TBR=oshima@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=201394

[msw, 2013-05-22 00:00:08]

Hey Oshima, take a look as you have time; thanks!

[msw, 2013-05-22 00:13:32]

Committed patchset #1 manually as r201394 (presubmit successful).

[oshima, 2013-05-22 03:01:04]

On 2013/05/22 00:13:32, msw wrote:
> Committed patchset #1 manually as r201394 (presubmit successful).

lgtm