Implements printing to CUPS with paper size, color, and duplexing
configurable.

Existing bug where the printer does not initialize the first time it is
selected.

BUG=607668

TEST=Enable --enable-native-cups.  Print a webpage to a desired CUPS
printer.

Review-Url: https://codereview.chromium.org/2117713002
Cr-Commit-Position: refs/heads/master@{#408179}