Reland kPMColor_SkColorType to kN32_SkColorType.

Reland kPMColor_SkColorType to kN32_SkColorType.

The new name better represents what this flag means.

TBR=reed@google.com

BUG=skia:2384

[scroggo, 2014-04-11 17:07:51]

The CQ bit was checked by scroggo@google.com

[commit-bot: I haz the power, 2014-04-11 17:07:53]

CQ is trying da patch. Follow status at
https://skia-tree-status.appspot.com/cq/scroggo@google.com/232773007/1

[commit-bot: I haz the power, 2014-04-11 17:08:14]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-04-11 17:08:15]

Presubmit check for 232773007-1 failed and returned exit status 1.

Running presubmit commit checks ...

** Presubmit ERRORS **
Since the CL is editing public API, you must have an LGTM from one of:
('reed@chromium.org', 'reed@google.com', 'bsalomon@chromium.org',
'bsalomon@google.com')

Presubmit checks took 1.4s to calculate.

[scroggo, 2014-04-11 17:23:39]

On 2014/04/11 17:08:15, I haz the power (commit-bot) wrote:
> Presubmit check for 232773007-1 failed and returned exit status 1.
> 
> Running presubmit commit checks ...
> 
> ** Presubmit ERRORS **
> Since the CL is editing public API, you must have an LGTM from one of:
> (mailto:, mailto:, mailto:,
> mailto:)
> 
> Presubmit checks took 1.4s to calculate.

Abandoning this one. Did a revert here:
https://codereview.chromium.org/235523003/