DM: SKP source / PDF backend

DM: SKP source / PDF backend

Removed expectations code for PDF backend for now, given that we don't have any, and refactored a little to make that cleaner.

We can now test .skp -> .pdf -> .png in DM.  Neat eh?

BUG=skia:2598
Committed: https://skia.googlesource.com/skia/+/e4d3e605f74a23d050abad29909af421d8b1cf1a

[mtklein, 2014-06-06 15:15:19]

ping?

[hal.canary, 2014-06-06 15:18:40]

On 2014/06/06 15:15:19, mtklein wrote:
> ping?

LGTM - we'll have to add expectations back at some point.

[mtklein, 2014-06-06 15:19:19]

On 2014/06/06 15:18:40, Hal Canary wrote:
> On 2014/06/06 15:15:19, mtklein wrote:
> > ping?
> 
> LGTM - we'll have to add expectations back at some point.

Yeah, if we ever have them beyond "it runs".

[mtklein, 2014-06-06 15:19:37]

The CQ bit was checked by mtklein@google.com

[commit-bot: I haz the power, 2014-06-06 15:19:55]

CQ is trying da patch. Follow status at
 https://skia-tree-status.appspot.com/cq/mtklein@chromium.org/316643003/20001

[commit-bot: I haz the power, 2014-06-06 15:46:15]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  Build-Win7-VS2010-x86-Debug-Trybot on tryserver.chromium
(http://108.170.220.76:10117/builders/Build-Win7-VS2010-x86-Debug-Trybot/build...)

[commit-bot: I haz the power, 2014-06-06 16:05:06]

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

[commit-bot: I haz the power, 2014-06-06 16:05:07]

Try jobs failed on following builders:
  Build-Win7-VS2010-x86-Debug-Trybot on tryserver.chromium
(http://108.170.220.76:10117/builders/Build-Win7-VS2010-x86-Debug-Trybot/build...)

[mtklein, 2014-06-06 16:11:08]

The CQ bit was checked by mtklein@google.com

[commit-bot: I haz the power, 2014-06-06 16:11:16]

CQ is trying da patch. Follow status at
 https://skia-tree-status.appspot.com/cq/mtklein@chromium.org/316643003/40001

[commit-bot: I haz the power, 2014-06-06 16:28:48]

Change committed as e4d3e605f74a23d050abad29909af421d8b1cf1a