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This patch adds a build flag, CAST_ALLOW_DEVELOPER_CERTIFICATE, and a
new command line switch ("--cast-developer-certificate-path") that allows
developers to pass in a PEM file containing a root cast certificate that
can be used for authentication.

Example usage:

-> % ./out/Default/Chromium.app/Contents/MacOS/Chromium --vmodule="*cert*=2" --cast-developer-certificate-path="generated_root_cast_receiver.crt"

Note that the certificate path MUST be in the same directory or nested below
the location of the Chrome executable. Referencing parent ("..") or using
an absolute path (e.g.
/usr/local/src/openscreen/generated_root_cast_receiver.crt)
will cause Chrome to refuse to load the certificate.

Bug: b/153079261
Change-Id: I8a8420547aeafb3535ce445ea72d13d9c3b18ddc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2472919
Commit-Queue: Jordan Bayles <jophba@chromium.org>
Reviewed-by: Jordan Bayles <jophba@chromium.org>
Reviewed-by: Doug Steedman <dougsteed@chromium.org>
Reviewed-by: mark a. foltz <mfoltz@chromium.org>
Reviewed-by: Yuri Wiitala <miu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826650}