Add linearly spaced counting histograms

Add linearly spaced counting histograms

This change adds HistogramFactoryGetCountsLinear and
RTC_HISTOGRAM_COUNTS_LINEAR. Note that the default implementation of
HistogramFactoryGetCounts in metrics_default.cc also provides a
linearly spaced histogram, while the Chrome UMA implementation
provides exponentially spaced buckets.

BUG=none

Committed: https://crrev.com/f29e05d774005eab99956f28b5a384509ea6b295
Cr-Commit-Position: refs/heads/master@{#15367}

[hlundin-webrtc, 2016-12-01 11:17:20]

henrik.lundin@webrtc.org changed reviewers:
+ asapersson@webrtc.org, tommi@webrtc.org

[hlundin-webrtc, 2016-12-01 11:17:20]

Åsa, WDYT about this implementation?

[åsapersson, 2016-12-01 12:09:57]

lgtm

[tommi, 2016-12-01 12:18:05]

lgtm

[hlundin-webrtc, 2016-12-01 12:27:54]

The CQ bit was checked by henrik.lundin@webrtc.org

[commit-bot: I haz the power, 2016-12-01 12:28:03]

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

[hlundin-webrtc, 2016-12-01 12:28:11]

The CQ bit was unchecked by henrik.lundin@webrtc.org

[hlundin-webrtc, 2016-12-01 17:57:05]

The CQ bit was checked by henrik.lundin@webrtc.org

[commit-bot: I haz the power, 2016-12-01 17:57:10]

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

[commit-bot: I haz the power, 2016-12-01 17:58:45]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1480615025153880, "parent_rev":
"904e85109198d3f4ab0a1bce6c3f2f7d0e2f17bb", "commit_rev":
"018b2e63a8563100938bf32bc710c6ae354e7a23"}

[commit-bot: I haz the power, 2016-12-01 17:58:49]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-12-01 17:59:00]

Description was changed from

==========
Add linearly spaced counting histograms

This change adds HistogramFactoryGetCountsLinear and
RTC_HISTOGRAM_COUNTS_LINEAR. Note that the default implementation of
HistogramFactoryGetCounts in metrics_default.cc also provides a
linearly spaced histogram, while the Chrome UMA implementation
provides exponentially spaced buckets.

BUG=none
==========

to

==========
Add linearly spaced counting histograms

This change adds HistogramFactoryGetCountsLinear and
RTC_HISTOGRAM_COUNTS_LINEAR. Note that the default implementation of
HistogramFactoryGetCounts in metrics_default.cc also provides a
linearly spaced histogram, while the Chrome UMA implementation
provides exponentially spaced buckets.

BUG=none

Committed: https://crrev.com/f29e05d774005eab99956f28b5a384509ea6b295
Cr-Commit-Position: refs/heads/master@{#15367}
==========

[commit-bot: I haz the power, 2016-12-01 17:59:00]

Patchset 1 (id:??) landed as
https://crrev.com/f29e05d774005eab99956f28b5a384509ea6b295
Cr-Commit-Position: refs/heads/master@{#15367}