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This patch adds error code for screen drawing failure. BUG=none BRANCH=tot TEST=Tested on Glados Change-Id: I04b349fd2c0bc539338b7ee27b8fa9544c85c873 Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/315257 Reviewed-by: Aaron Durbin <adurbin@chromium.org>