Porting relevant legacy conversion code from performance_lp to src side

BUG=chromium:633253
CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_precise_blink_rel

Review-Url: https://codereview.chromium.org/2479543002
Cr-Commit-Position: refs/heads/master@{#429997}
12 files changed