Test installing Google Chrome in SxS mode.
This change contains the following improvements to existing tests:
- The chrome_*_installed.prop and chrome_*_not_installed.prop files now
also verify the presence or absence of a "pv" value in the binaries'
Clients key.
This change contains the following enhancements to the test harness:
- .prop files may have a "Condition" that, if not True, causes the
file's contents to be ignored.
- Tests in the main .config file may have a "condition" that, if not
True, causes the test to be skpped.
BUG=456602
Review URL: https://codereview.chromium.org/
912183003
Cr-Commit-Position: refs/heads/master@{#316854}