GitLab

SetFromString that allows setting TraceOptions from a string instead.

SetFromString returns true upon success.

BUG=400382

Review URL: https://codereview.chromium.org/443523003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@288193 0039d316-1c4b-4281-b951-d872f2087c98