Added missing MainThreadScrollingReason in histograms.xml

Added missing MainThreadScrollingReason in histograms.xml

BUG=None

Committed: https://crrev.com/fc32a32da4a897ba1552de764367e13bd079e245
Cr-Commit-Position: refs/heads/master@{#380694}

[tdresser, 2016-03-03 15:57:16]

tdresser@chromium.org changed reviewers:
+ aelias@chromium.org, isherman@chromium.org

[tdresser, 2016-03-03 15:57:17]

+isherman@ for histograms.xml
+aelias@ for the rest

I've added a small test ensuring that the histogram recording logic is correct.

[tdresser, 2016-03-03 15:57:26]

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

[commit-bot: I haz the power, 2016-03-03 15:57:43]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1763713002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1763713002/1

[tdresser, 2016-03-03 15:58:28]

+ymalik, vollick FYI

[commit-bot: I haz the power, 2016-03-03 16:11:54]

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

[commit-bot: I haz the power, 2016-03-03 16:11:55]

Dry run: Try jobs failed on following builders:
  cast_shell_linux on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/cast_shell_linu...)

[Ilya Sherman, 2016-03-03 23:39:51]

histograms.xml lgtm

[aelias_OOO_until_Jul13, 2016-03-04 06:47:43]

lgtm

[tdresser, 2016-03-04 19:55:46]

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

[commit-bot: I haz the power, 2016-03-04 19:56:08]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1763713002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1763713002/20001

[commit-bot: I haz the power, 2016-03-04 20:02:10]

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

[commit-bot: I haz the power, 2016-03-04 20:02:11]

Dry run: Try jobs failed on following builders:
  android_clang_dbg_recipe on tryserver.chromium.android (JOB_FAILED,
https://build.chromium.org/p/tryserver.chromium.android/builders/android_clan...)
  android_compile_dbg on tryserver.chromium.android (JOB_FAILED,
https://build.chromium.org/p/tryserver.chromium.android/builders/android_comp...)
  cast_shell_android on tryserver.chromium.android (JOB_FAILED,
https://build.chromium.org/p/tryserver.chromium.android/builders/cast_shell_a...)
  chromium_presubmit on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/chromium_presub...)
  linux_chromium_asan_rel_ng on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)
  linux_chromium_chromeos_compile_dbg_ng on tryserver.chromium.linux
(JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)
  linux_chromium_chromeos_ozone_rel_ng on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)
  linux_chromium_chromeos_rel_ng on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[tdresser, 2016-03-11 15:40:41]

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

[commit-bot: I haz the power, 2016-03-11 15:40:49]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1763713002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1763713002/20001

[commit-bot: I haz the power, 2016-03-11 15:45:01]

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

[commit-bot: I haz the power, 2016-03-11 15:45:02]

Dry run: Try jobs failed on following builders:
  chromeos_amd64-generic_chromium_compile_only_ng on tryserver.chromium.linux
(JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/chromeos_amd64-...)
  mac_chromium_compile_dbg_ng on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_comp...)

[tdresser, 2016-03-11 17:47:23]

The CQ bit was checked by tdresser@chromium.org

[tdresser, 2016-03-11 17:47:23]

The patchset sent to the CQ was uploaded after l-g-t-m from aelias@chromium.org,
isherman@chromium.org
Link to the patchset: https://codereview.chromium.org/1763713002/#ps40001
(title: "Undo gyp change.")

[commit-bot: I haz the power, 2016-03-11 17:48:06]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1763713002/40001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1763713002/40001

[commit-bot: I haz the power, 2016-03-11 19:23:30]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2016-03-11 19:26:07]

Description was changed from

==========
Added missing MainThreadScrollingReason in histograms.xml

BUG=None
==========

to

==========
Added missing MainThreadScrollingReason in histograms.xml

BUG=None

Committed: https://crrev.com/fc32a32da4a897ba1552de764367e13bd079e245
Cr-Commit-Position: refs/heads/master@{#380694}
==========

[commit-bot: I haz the power, 2016-03-11 19:26:08]

Patchset 3 (id:??) landed as
https://crrev.com/fc32a32da4a897ba1552de764367e13bd079e245
Cr-Commit-Position: refs/heads/master@{#380694}