Auto Bisect: Added some real-world examples to confidence score unit test.

Auto Bisect: Added some real-world examples to confidence score unit test.

These were collected by Jeff last week: https://docs.google.com/a/google.com/document/d/1erjepFVXplUFXCybBd8aojjEDgoDGfM4V-j_GewPWOg/edit

In the examples that he collected, I think that most of the confidence score numbers were from the old confidence function. Some of the actual results still don't fully line up with intuition, for example:

    [67, 68], [65, 65, 67] -> 80%
    [3, 3, 3], [2, 2, 2, 3] -> 90%

In general, the t-test is always giving either 0 or at least 80 (sort of like how it is for alerts the dashboard).

BUG=

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=291559

[prasadv, 2014-08-22 16:20:56]

lgtm

[qyearsley, 2014-08-22 17:00:55]

The CQ bit was checked by qyearsley@chromium.org

[commit-bot: I haz the power, 2014-08-22 17:01:31]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/qyearsley@chromium.org/481063002/1

[commit-bot: I haz the power, 2014-08-22 18:09:26]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  android_chromium_gn_compile_rel on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/android_chromiu...)

[commit-bot: I haz the power, 2014-08-22 18:12:57]

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

[commit-bot: I haz the power, 2014-08-22 18:12:58]

Try jobs failed on following builders:
  android_chromium_gn_compile_rel on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/android_chromiu...)

[qyearsley, 2014-08-22 18:57:27]

On 2014/08/22 18:12:58, I haz the power (commit-bot) wrote:
> Try jobs failed on following builders:
>   android_chromium_gn_compile_rel on tryserver.chromium.linux
>
(http://build.chromium.org/p/tryserver.chromium.linux/builders/android_chromiu...)

Failure appears unrelated, re-trying.

[qyearsley, 2014-08-22 18:57:29]

The CQ bit was checked by qyearsley@chromium.org

[commit-bot: I haz the power, 2014-08-22 18:58:47]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/qyearsley@chromium.org/481063002/1

[commit-bot: I haz the power, 2014-08-22 19:02:02]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  android_chromium_gn_compile_rel on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/android_chromiu...)

[commit-bot: I haz the power, 2014-08-22 19:04:29]

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

[commit-bot: I haz the power, 2014-08-22 19:04:30]

Try jobs failed on following builders:
  android_chromium_gn_compile_rel on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/android_chromiu...)

[qyearsley, 2014-08-22 23:44:52]

The CQ bit was checked by qyearsley@chromium.org

[commit-bot: I haz the power, 2014-08-22 23:46:32]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/qyearsley@chromium.org/481063002/1

[commit-bot: I haz the power, 2014-08-22 23:53:25]

Committed patchset #1 (1) as 291559