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When a port value in printer URI is not specified, the default port
number assigned to the URI protocol is assumed. However, for ipps
protocol the default port number in ChromeOS is 443, while in CUPS
the value 631 is assumed. As a results, CUPS tries to connect to
port 631 when the port 443 is specified on ChromeOS side. This patch
solves this issue by enforcing presence of port number in all URI
sent to CUPS.

BUG=b:172961564
TEST=tested on atlas device by checking URIs in CUPS with lpstat -v

Change-Id: I0a00ab2f9230a8a159483da4370df15d86f58bab
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2538254
Commit-Queue: Piotr Pawliczek <pawliczek@chromium.org>
Reviewed-by: Sean Kau <skau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828411}