When not writing to file in DM, spew verbose output to stderr

When not writing to file in DM, spew verbose output to stderr

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1788743002

Committed: https://skia.googlesource.com/skia/+/40dec542cc12b354762bca2c0d68bc419f0cbebd

[egdaniel, 2016-03-11 14:54:26]

Description was changed from

==========
When not writing to file in DM, spew verbose output to stderr

BUG=skia:
==========

to

==========
When not writing to file in DM, spew verbose output to stderr

BUG=skia:
GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...
==========

[egdaniel, 2016-03-11 14:54:53]

egdaniel@google.com changed reviewers:
+ mtklein@google.com

[egdaniel, 2016-03-11 14:55:28]

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

[commit-bot: I haz the power, 2016-03-11 14:55:35]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1788743002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1788743002/1

[mtklein, 2016-03-11 15:02:42]

lgtm

[commit-bot: I haz the power, 2016-03-11 15:13:04]

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

[commit-bot: I haz the power, 2016-03-11 15:13:05]

Dry run: This issue passed the CQ dry run.

[egdaniel, 2016-03-11 15:13:46]

The CQ bit was checked by egdaniel@google.com

[commit-bot: I haz the power, 2016-03-11 15:13:54]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1788743002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1788743002/1

[commit-bot: I haz the power, 2016-03-11 15:14:51]

Description was changed from

==========
When not writing to file in DM, spew verbose output to stderr

BUG=skia:
GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...
==========

to

==========
When not writing to file in DM, spew verbose output to stderr

BUG=skia:
GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...

Committed:
https://skia.googlesource.com/skia/+/40dec542cc12b354762bca2c0d68bc419f0cbebd
==========

[commit-bot: I haz the power, 2016-03-11 15:14:52]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/40dec542cc12b354762bca2c0d68bc419f0cbebd

[mtklein, 2016-03-11 20:58:53]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/1783603006/ by mtklein@google.com.

The reason for reverting is: Looks like not all the bots are using --writePath
(think, Valgrind, *SAN) so this causes those bots to spew like crazy.  

Looks like we need to find a more explicit way to make this mode work..