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Adds libjpeg and some global flags for Ozone from the GYP build.

Improves error messages for mismatched item types I noticed when writing this patch (changes in builder.cc).

BUG=
R=bradnelson@google.com

Review URL: https://codereview.chromium.org/224633002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@263086 0039d316-1c4b-4281-b951-d872f2087c98