re-enable mrt
The problem was a bug in mesa, which has now been fixed in the chrome tree.
crbug.com/308715 tracks the progress of upstreaming the mesa bug.

BUG=260048

Review URL: https://codereview.chromium.org/28553007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@230166 0039d316-1c4b-4281-b951-d872f2087c98
GTTF: refactor interface between TestLauncher and its delegate

This is a preparation for implementing test retries. Instead of callbacks
the delegate calls TestLauncher directly, and receives the full list of tests
in one call.

BUG=236893
R=sky@chromium.org

Review URL: https://codereview.chromium.org/32433004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@230167 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 230167
Output std err as percent. Previously, std error was just being displayed as is but the output makes it look like it's being expressed as a % change.

Here's an example of the confusing output:

Tested commits:
         Depot                         Commit SHA                     Mean       Std. Error       State    
        chromium        d1ec3f7f30d07132bf0f75e4938d50a508bc7637  88693362.94    +-89200.54        Bad     
        chromium        737540d94a6d97afcf9ff780c10417886b8ed145  89197592.98   +-464098.05        Bad     
        chromium        730f3062b316f9c1f18284357f5f670013a02ee9  89244330.67   +-360230.50        Bad     
        chromium        c3b4ba8f43dd89cb62ae5d82db8be245e61f17ae  89132646.40   +-360226.98        Bad     
        chromium        5d03cedb6ace85bf9e227c84e7b40d77d1d39844  89225216.00    +-95084.90        Bad     
        chromium        31c4144f6a642d953d2b7f7b25bf9d597be3c36b  89085952.00   +-438774.78        Bad     

        chromium        657be329489e70fb8237db4f40726794ad224bdf  89262013.94    +-86984.39    Suspected CL

        chromium        3e1c741eaf73c7391972e50f03c139bba74661fd  78078192.94   +-1128824.27       Good    
        chromium        fb7a295a9cec4b1c4824842d2c80d6cc1487d736  78248323.46   +-1112737.96       Good    
        chromium        66283c1ad3028d943c9cc7a32e4f37e967492f9c  76246295.27   +-903342.37        Good    
        chromium        34a3d3736598bc54f1f1cc7383c9d5c99e4bc57e  76418092.52   +-864243.39        Good    

Average step time: 0:20:14
Approximate size of regression: 11.36%, +-414705.17% std. err
Confidence in Bisection Results: 100%

BUG=297828
NOTRY=true

Review URL: https://codereview.chromium.org/35653002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@230168 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 230168