Add additional information to FAIL lines for animation interpolation tests

Add additional information to FAIL lines for animation interpolation tests

This change adds to the FAIL line the parsed value of the expected style, which
can help with debugging. For example ...

FAIL: border-image-width from [0] to [20] was [0] at -0.3, expected [0]

becomes ...

FAIL: border-image-width from [0] to [20] was [0] at -0.3, expected [0] (parsed as [0px])

R=dstockwell@chromium.org

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=161327

[alancutter (OOO until 2018), 2013-11-04 00:05:51]

lgtm

I would even consider going as far as dropping the handwritten version of the
expected CSS value in favour of displaying values in a consistent format when a
test fails.

[Steve Block, 2013-11-04 00:12:07]

On 2013/11/04 00:05:51, alancutter wrote:
> lgtm
> 
> I would even consider going as far as dropping the handwritten version of the
> expected CSS value in favour of displaying values in a consistent format when
a
> test fails.

I think it's good to present both the 'supplied' and 'parsed' versions of the
expected values. I'm open to switching which of these two appears first vs which
appears in brackets.

[commit-bot: I haz the power, 2013-11-05 04:09:57]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/steveblock@chromium.org/54293006/130001

[commit-bot: I haz the power, 2013-11-05 06:06:18]

Retried try job too often on linux_blink_rel for step(s) webkit_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=linux_blin...

[commit-bot: I haz the power, 2013-11-05 06:10:28]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/steveblock@chromium.org/54293006/130001

[commit-bot: I haz the power, 2013-11-05 06:36:41]

Failed to trigger a try job on linux_blink
HTTP Error 400: Bad Request

[commit-bot: I haz the power, 2013-11-05 06:36:47]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/steveblock@chromium.org/54293006/360001

[commit-bot: I haz the power, 2013-11-05 08:51:02]

Retried try job too often on win_blink_rel for step(s) webkit_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=win_blink_...

[commit-bot: I haz the power, 2013-11-05 09:33:21]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/steveblock@chromium.org/54293006/530001

[commit-bot: I haz the power, 2013-11-05 12:29:30]

Change committed as 161327