[heap] Add histogram counters to track GC reasons.

[heap] Add histogram counters to track GC reasons.

BUG=chromium:644713
LOG=NO

Committed: https://crrev.com/371c7a388fed901c7403aa5afbcbff9ee81ce077
Cr-Commit-Position: refs/heads/master@{#39250}

[ulan, 2016-09-07 12:50:49]

Description was changed from

==========
[heap] Add histogram counters to track GC reasons.

BUG=
==========

to

==========
[heap] Add histogram counters to track GC reasons.

BUG=chromium:644713
LOG=NO
==========

[ulan, 2016-09-07 12:50:49]

ulan@chromium.org changed reviewers:
+ mlippautz@chromium.org

[ulan, 2016-09-07 12:50:57]

PTAL

[Michael Lippautz, 2016-09-07 13:03:28]

lgtm, thanks for the comment! (Will hopefully save us from screwing up UMA)

[ulan, 2016-09-07 13:04:25]

The CQ bit was checked by ulan@chromium.org

[commit-bot: I haz the power, 2016-09-07 13:04:34]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-09-07 13:30:32]

Description was changed from

==========
[heap] Add histogram counters to track GC reasons.

BUG=chromium:644713
LOG=NO
==========

to

==========
[heap] Add histogram counters to track GC reasons.

BUG=chromium:644713
LOG=NO
==========

[commit-bot: I haz the power, 2016-09-07 13:30:34]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-09-07 13:31:02]

Description was changed from

==========
[heap] Add histogram counters to track GC reasons.

BUG=chromium:644713
LOG=NO
==========

to

==========
[heap] Add histogram counters to track GC reasons.

BUG=chromium:644713
LOG=NO

Committed: https://crrev.com/371c7a388fed901c7403aa5afbcbff9ee81ce077
Cr-Commit-Position: refs/heads/master@{#39250}
==========

[commit-bot: I haz the power, 2016-09-07 13:31:03]

Patchset 2 (id:??) landed as
https://crrev.com/371c7a388fed901c7403aa5afbcbff9ee81ce077
Cr-Commit-Position: refs/heads/master@{#39250}