ASSERTION FAILED: newStartAngle >= 0 && newStartAngle < twoPiFloat.

ASSERTION FAILED: newStartAngle >= 0 && newStartAngle < twoPiFloat.

We can calculate |newStartAngle| as follows if |startAngle| is negative value.

  newStartAngle = twoPiFloat + fmodf(startAngle, -twoPiFloat);

The fmodf() is always 0 if |startAngle| is negative multiples of |twoPiFloat|.
So, |newStartAngle| will be |twoPiFloat| and it causes assertion failure.

BUG=449053
TEST=https://cluster-fuzz.appspot.com/testcase?key=4815021346390016

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=188510

[zino, 2015-01-15 13:40:40]

jinho.bang@samsung.com changed reviewers:
+ dongseong.hwang@intel.com, junov@chromium.org

[zino, 2015-01-15 13:40:40]

Please take a look.

Thank you.

[dshwang, 2015-01-15 15:59:38]

non-owner lgtm, thx

[Justin Novosad, 2015-01-15 16:03:12]

On 2015/01/15 15:59:38, dshwang wrote:
> non-owner lgtm, thx

lgtm

[zino, 2015-01-16 00:20:02]

The CQ bit was checked by jinho.bang@samsung.com

[commit-bot: I haz the power, 2015-01-16 00:20:46]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/801053009/1

[commit-bot: I haz the power, 2015-01-16 01:11:42]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=188510