m_parsedCalculation has to be cleared between parsing cubic-bezier()

Fixing calc() parameter parsing in cubic-bezier functions

Before this patch, calc values in cubic-bezier functions
weren't being read correctly since they were handled as
simple floats.

R=rob.buis@samsung.com,timloh@chromium.org,alancutter@chromium.org
BUG=388332
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=178998

[alancutter (OOO until 2018), 2014-07-07 00:25:27]

This fixes the assertion failure but does not fix the bug in the code.
If m_parsedCalculation is set after validUnit() is called that means the value
was a calc and not a float so reading v->fValue on line 3129 is wrong.
Instead of reading fValue this code should use parsedDouble() to get the value.

[reni, 2014-07-21 13:22:26]

@alancutter: thanks for the review! The patch is updated according to your
suggestion.

[alancutter (OOO until 2018), 2014-07-22 05:14:34]

Much better, lgtm. :)

The title and description could be updated to state that the calcs weren't being
read properly for cubic-beziers which is what this patch is fixing now.

The test should now check that the computed value of the transition property is
correct as before this patch it was reading the wrong value.

[reni, 2014-07-25 12:25:42]

The test case is updated.
@alancutter, @timloh: ping me please if I can commit.

[Timothy Loh, 2014-07-28 00:27:18]

On 2014/07/25 12:25:42, reni wrote:
> The test case is updated.
> @alancutter, @timloh: ping me please if I can commit.

alancutter says he's fine with this landing; lgtm

[alancutter (OOO until 2018), 2014-07-28 00:27:52]

The CQ bit was checked by alancutter@chromium.org

[commit-bot: I haz the power, 2014-07-28 00:28:58]

CQ is trying da patch. Follow status at

https://chromium-status.appspot.com/cq/rhodovan.u-szeged@partner.samsung.com/...

[commit-bot: I haz the power, 2014-07-28 01:32:23]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  win_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/win_blink_rel/builds/19145)

[commit-bot: I haz the power, 2014-07-28 02:29:58]

Change committed as 178998