Added viewport tests for missing/empty content attribute.

Added viewport tests for missing/empty content attribute.

For <meta name="viewport" ... >:

- content="" overrides previous meta viewport using the 980px fallback width.
- content without a value is a no-op.
- missing content attribute is a no-op.

Added tests to detect future regressions.

BUG=None

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=156857

[Mike West, 2013-08-28 14:37:59]

On 2013/08/28 14:33:21, rune wrote:

These are new tests, right? The diff view doesn't make that clear.

If so, LGTM. :)

[rune, 2013-08-28 14:39:25]

On 2013/08/28 14:37:59, Mike West wrote:
> On 2013/08/28 14:33:21, rune wrote:
> 
> These are new tests, right? The diff view doesn't make that clear.
> 
> If so, LGTM. :)

Yes, they are new.

[commit-bot: I haz the power, 2013-08-28 14:40:32]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/rune@opera.com/23495008/1

[commit-bot: I haz the power, 2013-08-28 16:30:47]

Change committed as 156857