Properly check for a zero-valued floating-point viewport argument

Properly check for a zero-valued floating-point viewport argument

Zero-valued viewport arguments are given special treatment under certain
circumstances. Fix an issue where argument values less than 1 were incorrectly
cast to zero, resulting in an improperly configured viewport.

BUG=295886, 282130
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=158197

[jdduke (slow), 2013-09-20 22:48:20]

PTAL.

[jdduke (slow), 2013-09-21 02:19:30]

On 2013/09/20 22:48:20, jdduke wrote:
> PTAL.

I'll add some testing coverage to WebFrameTest assuming we agree on this change.

[mnaganov (inactive), 2013-09-23 09:26:08]

LGTM

Thanks for the fix, Jared! Sorry, I totally forgot that floats <1 are cast down
to 0.

[jdduke (slow), 2013-09-23 15:41:49]

abarth@: PTAL for owners. Thanks.

[abarth-chromium, 2013-09-23 17:12:49]

lgtm

[commit-bot: I haz the power, 2013-09-23 17:12:58]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/jdduke@chromium.org/23754026/12001

[commit-bot: I haz the power, 2013-09-23 18:38:20]

Change committed as 158197