Add JSON output option to bench.

A new command-line flag --outResultsFile takes the filename to write the JSON into.

The human readable output is the same as before with one exception. Previously DEBUG would be printed if in debug mode, or nothing would be printed if in release mode. Now this is reported as a named option:

  build=DEBUG

or

  build=RELEASE

R=djsollen@google.com, bsalomon@google.com

Author: jcgregorio@google.com

Review URL: https://codereview.chromium.org/83863002

git-svn-id: http://skia.googlecode.com/svn/trunk@12465 2bbb7eff-a529-9590-31e7-b0007b416f81
6 files changed