Added TestCreate for GrComposeEffect

Added TestCreate for SkComposeShader;  will pick two random child procs that don't have children of their own.  This prevents creating an arbitrarily large tree of procs.  Also, it will choose a random coefficient mode for the xfermode.

BUG=skia:4182
Committed: https://skia.googlesource.com/skia/+/036fd8e6f66b53cf87a5f91083cae82f0aeb3635

[wangyix, 2015-08-21 14:17:02]

wangyix@google.com changed reviewers:
+ bsalomon@google.com, joshualitt@google.com, tomhudson@google.com

[joshualitt, 2015-08-21 14:17:47]

On 2015/08/21 14:17:02, wangyix wrote:

lgtm

[wangyix, 2015-09-08 15:42:48]

The CQ bit was checked by wangyix@google.com

[wangyix, 2015-09-08 15:42:49]

The patchset sent to the CQ was uploaded after l-g-t-m from
joshualitt@google.com
Link to the patchset: https://codereview.chromium.org/1306163002/#ps40001
(title: "rebase")

[commit-bot: I haz the power, 2015-09-08 15:42:55]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1306163002/40001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1306163002/40001

[commit-bot: I haz the power, 2015-09-08 15:43:37]

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

[commit-bot: I haz the power, 2015-09-08 15:43:38]

Try jobs failed on following builders:
  Build-Ubuntu-GCC-Mips-Debug-Android-Trybot on client.skia.compile (JOB_FAILED,
http://build.chromium.org/p/client.skia.compile/builders/Build-Ubuntu-GCC-Mip...)

[wangyix, 2015-09-08 15:50:12]

The CQ bit was checked by wangyix@google.com to run a CQ dry run

[commit-bot: I haz the power, 2015-09-08 15:50:26]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1306163002/60001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1306163002/60001

[commit-bot: I haz the power, 2015-09-08 15:51:27]

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

[commit-bot: I haz the power, 2015-09-08 15:51:27]

Dry run: Try jobs failed on following builders:
  Build-Ubuntu-GCC-Arm64-Debug-Android-Trybot on client.skia.compile
(JOB_FAILED,
http://build.chromium.org/p/client.skia.compile/builders/Build-Ubuntu-GCC-Arm...)
  Build-Ubuntu-GCC-Arm7-Debug-Android-Trybot on client.skia.compile (JOB_FAILED,
http://build.chromium.org/p/client.skia.compile/builders/Build-Ubuntu-GCC-Arm...)

[wangyix, 2015-09-08 20:43:31]

The CQ bit was checked by wangyix@google.com to run a CQ dry run

[commit-bot: I haz the power, 2015-09-08 20:43:43]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1306163002/80001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1306163002/80001

[commit-bot: I haz the power, 2015-09-08 20:48:24]

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

[commit-bot: I haz the power, 2015-09-08 20:48:25]

Dry run: This issue passed the CQ dry run.

[wangyix, 2015-09-08 20:56:12]

Brian, can you take a quick look at the latest patchset?  I just added #if
SK_ALLOW_STATIC_GLOBAL_INITIALIZERS to TestCreate() since GrProcessorTestFactor
isn't defined otherwise.

[bsalomon, 2015-09-08 22:21:48]

On 2015/09/08 20:56:12, wangyix wrote:
> Brian, can you take a quick look at the latest patchset?  I just added #if
> SK_ALLOW_STATIC_GLOBAL_INITIALIZERS to TestCreate() since
GrProcessorTestFactor
> isn't defined otherwise.

lgtm

[wangyix, 2015-09-08 22:22:55]

The CQ bit was checked by wangyix@google.com

[wangyix, 2015-09-08 22:22:55]

The patchset sent to the CQ was uploaded after l-g-t-m from
joshualitt@google.com
Link to the patchset: https://codereview.chromium.org/1306163002/#ps80001
(title: "added #if STATIC_GLOBAL")

[commit-bot: I haz the power, 2015-09-08 22:23:00]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1306163002/80001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1306163002/80001

[commit-bot: I haz the power, 2015-09-08 22:23:37]

Committed patchset #5 (id:80001) as
https://skia.googlesource.com/skia/+/036fd8e6f66b53cf87a5f91083cae82f0aeb3635