Add supporting style files for CtsVerifier reports.
Add utility functions for device-side result reporting.

Bug: 28831123, 33222380
Test: Run CtsVerifier tests. Save the result and open
the result zip file. There should be styling files as well
as the result XML file. CTS tests should run normally.

Change-Id: I9565540d47cee3f019634b13279443414f8f3ed5
(cherry picked from commit 25a73122386751fb9623d43096169df63293d66e)
11 files changed