Implement automatic text track selection for 'metadata' tracks

Previously 'metadata' tracks were being configured using the "perform
automatic text track selection" algorithm from the the spec, while it
should only have applied step 4 of the "honor user preferences for
automatic text track selection" algorithm.

BUG=251254

Review URL: https://codereview.chromium.org/882993002

git-svn-id: svn://svn.chromium.org/blink/trunk@189185 bbb929c8-8fbe-4397-9dbb-9b2b20218538
3 files changed
tree: 1b0cc7f5b757c746bfb30053fc9d1512c2f3cac5
  1. third_party/