Tighten the asserts in VTTCue::calculateDisplayParameters()

BUG=none

Review URL: https://codereview.chromium.org/276183002

git-svn-id: svn://svn.chromium.org/blink/trunk@173842 bbb929c8-8fbe-4397-9dbb-9b2b20218538
1 file changed
tree: 97a32b60c4839f0090d9cb4efd966373d22a5411
  1. third_party/