DM crash handler tweaks

DM crash handler tweaks

    - try to guard against reentrant signals.
    - re-raise the signal with the default handler when done printing.
    - support Windows

BUG=589654
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1744553002

Committed: https://skia.googlesource.com/skia/+/f85572956473efd8298522acb4bf0ee75cbdb86b

[mtklein_C, 2016-02-26 18:22:34]

Description was changed from

==========
DM crash handler tweaks

   - call _Exit() to make sure we exit right away, no destructors, no at_exit(),
etc.
   - try to guard against reentrant signals.  If our signal handler causes a
signal,
     just skip down to the _Exit() call.

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

to

==========
DM crash handler tweaks

   - call _Exit() to make sure we exit right away, no destructors, no at_exit(),
etc.
   - try to guard against reentrant signals.  If our signal handler causes a
signal,
     just skip down to the _Exit() call.

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

[mtklein_C, 2016-02-26 18:23:23]

Description was changed from

==========
DM crash handler tweaks

   - call _Exit() to make sure we exit right away, no destructors, no at_exit(),
etc.
   - try to guard against reentrant signals.  If our signal handler causes a
signal,
     just skip down to the _Exit() call.

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

to

==========
DM crash handler tweaks

   - call _Exit() to make sure we exit right away, no destructors, no at_exit(),
etc.
   - try to guard against reentrant signals.  If our signal handler causes a
signal,
     just skip down to the _Exit() call.

BUG=589654
GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...
==========

[mtklein_C, 2016-02-26 18:24:04]

The CQ bit was checked by mtklein@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-02-26 18:24:20]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1744553002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1744553002/1

[mtklein_C, 2016-02-26 18:26:55]

The CQ bit was unchecked by mtklein@chromium.org

[mtklein_C, 2016-02-26 18:27:25]

The CQ bit was checked by mtklein@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-02-26 18:27:34]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1744553002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1744553002/1

[commit-bot: I haz the power, 2016-02-26 18:28:42]

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

[commit-bot: I haz the power, 2016-02-26 18:28:43]

Dry run: Try jobs failed on following builders:
  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...)

[mtklein_C, 2016-02-26 18:29:44]

The CQ bit was checked by mtklein@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-02-26 18:29:49]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1744553002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1744553002/20001

[commit-bot: I haz the power, 2016-02-26 18:31:36]

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

[commit-bot: I haz the power, 2016-02-26 18:31:37]

Dry run: Try jobs failed on following builders:
  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...)

[mtklein, 2016-02-27 00:20:34]

Description was changed from

==========
DM crash handler tweaks

   - call _Exit() to make sure we exit right away, no destructors, no at_exit(),
etc.
   - try to guard against reentrant signals.  If our signal handler causes a
signal,
     just skip down to the _Exit() call.

BUG=589654
GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...
==========

to

==========
DM crash handler tweaks

    - re-raise the signal with the default handler when done printing.
    - try to guard against reentrant signals.

BUG=589654
GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...
==========

[mtklein, 2016-02-27 00:20:53]

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

[commit-bot: I haz the power, 2016-02-27 00:20:56]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1744553002/40001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1744553002/40001

[commit-bot: I haz the power, 2016-02-27 00:32:00]

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

[commit-bot: I haz the power, 2016-02-27 00:32:01]

Dry run: This issue passed the CQ dry run.

[mtklein, 2016-02-27 00:33:16]

Description was changed from

==========
DM crash handler tweaks

    - re-raise the signal with the default handler when done printing.
    - try to guard against reentrant signals.

BUG=589654
GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...
==========

to

==========
DM crash handler tweaks

    - try to guard against reentrant signals.
    - re-raise the signal with the default handler when done printing.
    - support Windows

BUG=589654
GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...
==========

[mtklein, 2016-02-27 00:33:22]

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

[commit-bot: I haz the power, 2016-02-27 00:33:32]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1744553002/60001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1744553002/60001

[mtklein_C, 2016-02-27 00:38:19]

The CQ bit was unchecked by mtklein@chromium.org

[mtklein_C, 2016-02-27 00:58:47]

mtklein@chromium.org changed reviewers:
+ borenet@google.com
- mtklein@google.com

[mtklein_C, 2016-02-27 00:58:47]

Think you can point me (or this CL) at some of the problem trybots?

[borenet, 2016-02-28 19:45:26]

On 2016/02/27 00:58:47, mtklein_C wrote:
> Think you can point me (or this CL) at some of the problem trybots?

Added the GalaxyS3 trybot which had the issue before.  It's not consistent
though, so it may not tell us anything?

[mtklein_C, 2016-02-29 14:06:56]

Hmm.  Hard to say if it doesn't crash.  Want to give it a shot?  Shouldn't be
worse.

[borenet, 2016-02-29 14:20:27]

On 2016/02/29 14:06:56, mtklein_C wrote:
> Hmm.  Hard to say if it doesn't crash.  Want to give it a shot?  Shouldn't be
> worse.

Sure, LGTM

[mtklein, 2016-02-29 14:25:07]

The CQ bit was checked by mtklein@google.com

[commit-bot: I haz the power, 2016-02-29 14:25:12]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1744553002/60001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1744553002/60001

[commit-bot: I haz the power, 2016-02-29 14:35:31]

Description was changed from

==========
DM crash handler tweaks

    - try to guard against reentrant signals.
    - re-raise the signal with the default handler when done printing.
    - support Windows

BUG=589654
GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...
==========

to

==========
DM crash handler tweaks

    - try to guard against reentrant signals.
    - re-raise the signal with the default handler when done printing.
    - support Windows

BUG=589654
GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...

Committed:
https://skia.googlesource.com/skia/+/f85572956473efd8298522acb4bf0ee75cbdb86b
==========

[commit-bot: I haz the power, 2016-02-29 14:35:32]

Committed patchset #4 (id:60001) as
https://skia.googlesource.com/skia/+/f85572956473efd8298522acb4bf0ee75cbdb86b