polyglot/palette: Canvas as a frontend for polyglot

Alyssa Rosenzweig 7cea452997 Move everything up one		7 年之前
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back-disabled.png	7cea452997 Move everything up one	7 年之前
back.png	7cea452997 Move everything up one	7 年之前
background-slice.png	7cea452997 Move everything up one	7 年之前
blue-circle-nav.png	7cea452997 Move everything up one	7 年之前
close.png	7cea452997 Move everything up one	7 年之前
forward-disabled.png	7cea452997 Move everything up one	7 年之前
forward.png	7cea452997 Move everything up one	7 年之前
separator.png	7cea452997 Move everything up one	7 年之前
white-circle-nav.png	7cea452997 Move everything up one	7 年之前