Add the ability to upload perf results to CBuildbotFactory.
Add the ability to upload perf results to CBuildbotFactory.

This change adds the ability to upload performance results from
cbuildbot to a perf dashboard. In order to use it, the cbuildbot
config should store perf results in its cbuildbot_log directory
using the naming scheme <test_name>.extension. These results
will then be uploaded to the perf dashboard under the cbuildbot
config name as the Platform name and testname given by the name.

In order to configure in a master.cfg, perf_file=<filename> must be
set.

BUG=chromium-os:35659
TEST=Ran with local slave with file I downloaded.


Review URL: https://chromiumcodereview.appspot.com/11262046

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@164246 0039d316-1c4b-4281-b951-d872f2087c98

eunchong/build,eunchong/build,eunchong/build,eunchong/build