Do not calculate the same gradient length for every color stops.

Do not calculate the same gradient length for every color stops.

The value of |gradientLength| in blink::CSSGradientValue::addStops
only depends on |gradientStart| and |gradientEnd| which values don't
change after their initializations, so |gradientLength| won't either.
In spite of this, the |gradientLength| is computed for every color
stops because |computedGradientLength| - the variable that was
originally introduced to check if |gradientLength| was set already -
is never changed to true.
The patch supplies this missing switch.

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=188224

[reni, 2014-12-15 17:10:07]

The failing bots seem to be unrelated to the change.

[reni, 2014-12-16 14:45:38]

rhodovan.u-szeged@partner.samsung.com changed reviewers:
+ timloh@chromium.org

[reni, 2015-01-07 14:18:04]

Could someone take a look at this, please?

[Mike West, 2015-01-12 14:17:42]

mkwst@chromium.org changed reviewers:
+ mkwst@chromium.org

[Mike West, 2015-01-12 14:17:43]

LGTM.

[reni, 2015-01-12 14:53:53]

The CQ bit was checked by rhodovan.u-szeged@partner.samsung.com

[commit-bot: I haz the power, 2015-01-12 14:54:24]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/794123003/1

[commit-bot: I haz the power, 2015-01-12 15:25:56]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=188224