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This way the size should always remain the same regardless of the
origin. Also, it's important that we ceil here otherwise a round trip
for DIP to screen to DIP could result in a smaller value resulting in
all sorts of wierdness.

BUG=417392
TEST=see bug
R=ananta@chromium.org

Review URL: https://codereview.chromium.org/600103002

Cr-Commit-Position: refs/heads/master@{#296559}