Remove special case gpu transforms for Identity and Translate

Remove special case gpu transforms for Identity and Translate

Change will remove some special cases for coord transforms in favor of not needing to compile
a new program if the coord trans changes from one special case to another.

BUG=skia:

Committed: https://skia.googlesource.com/skia/+/4c6443e86927c8cbf794d7c154470b9675aa7778

[bsalomon, 2014-06-24 20:02:02]

lgtm. Any chance this changes GMs ever so slightly?

[bsalomon, 2014-06-24 20:02:32]

On 2014/06/24 20:02:02, bsalomon wrote:
> lgtm. Any chance this changes GMs ever so slightly?

Just noticed that you ran the "Test" bots, so the answer is probably no.

[egdaniel, 2014-06-24 20:10:23]

The CQ bit was checked by egdaniel@google.com

[egdaniel, 2014-06-24 20:10:23]

The CQ bit was unchecked by egdaniel@google.com

[egdaniel, 2014-06-24 20:10:23]

The CQ bit was checked by egdaniel@google.com

[commit-bot: I haz the power, 2014-06-24 20:11:02]

CQ is trying da patch. Follow status at
 https://skia-tree-status.appspot.com/cq/egdaniel@google.com/344233006/1

[commit-bot: I haz the power, 2014-06-24 20:25:42]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  Build-Mac10.8-Clang-x86-Release-Trybot on tryserver.skia
(http://108.170.220.76:10117/builders/Build-Mac10.8-Clang-x86-Release-Trybot/b...)
  Build-Ubuntu13.10-Clang-x86_64-Debug-Trybot on tryserver.skia
(http://108.170.220.76:10117/builders/Build-Ubuntu13.10-Clang-x86_64-Debug-Try...)

[egdaniel, 2014-06-24 20:27:48]

The CQ bit was checked by egdaniel@google.com

[commit-bot: I haz the power, 2014-06-24 20:28:22]

CQ is trying da patch. Follow status at
 https://skia-tree-status.appspot.com/cq/egdaniel@google.com/344233006/20001

[commit-bot: I haz the power, 2014-06-24 20:43:17]

Change committed as 4c6443e86927c8cbf794d7c154470b9675aa7778