cc: Trace event for veto reason

cc: Trace event for veto reason

Allow a pointer to a |reason| string to be passed through the
|Picture| to the |SkPicture|.

Create an instant event when the gpu rasterization veto
is hit.

BUG=434613
Committed: https://crrev.com/699655243cf97aac9e8b859c49f5fe710b0d0e0c
Cr-Commit-Position: refs/heads/master@{#306683}

[hendrikw, 2014-12-03 20:16:55]

hendrikw@chromium.org changed reviewers:
+ enne@chromium.org

[hendrikw, 2014-12-03 20:16:55]

PTAL, thanks!

[enne (OOO), 2014-12-03 20:54:56]

lgtm

[hendrikw, 2014-12-03 21:05:18]

The CQ bit was checked by hendrikw@chromium.org

[commit-bot: I haz the power, 2014-12-03 21:05:29]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/780683002/1

[commit-bot: I haz the power, 2014-12-03 21:48:12]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-12-03 21:49:26]

Patchset 1 (id:??) landed as
https://crrev.com/699655243cf97aac9e8b859c49f5fe710b0d0e0c
Cr-Commit-Position: refs/heads/master@{#306683}