Add Telemetry default results file and script to manipulate it.

Add a json file containing the default results to be used for generating
Telemetry benchmark reports (to cut down on all the unnecessary results
being show.  Also add a script that allows people to examine and
manipulate the default results file.

BUG=None
TEST=Used the script to create and manipulate the defaults file myself.
Also used the defaults file, in my private Crosperf checkout, for generating
Crosperf Telemetry reports. Ran 'cros lint' on script also.

Change-Id: I280af3414796bf9acd283e3d56d8783186e1a0ad
Reviewed-on: https://chrome-internal-review.googlesource.com/149331
Reviewed-by: Luis Lozano <llozano@chromium.org>
Tested-by: Caroline Tice <cmtice@google.com>
Commit-Queue: Caroline Tice <cmtice@google.com>
2 files changed