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To support the redesign, support two new parameters: ta and tf, which stand for text-align and text fade. For text fade, a linear gradient is created to gently fade the text overflow.

BUG=400332,400341
TBR=jered
TEST=manual

Review URL: https://codereview.chromium.org/448793003

Cr-Commit-Position: refs/heads/master@{#288234}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@288234 0039d316-1c4b-4281-b951-d872f2087c98