Do not adjust subpixel if the window's position is controlled by client.

BUG=730903
TEST=manual. ARC++ apps looks crisp on 1.25 and 1.6 dsf regardless of its position.

Review-Url: https://codereview.chromium.org/2927003002
Cr-Commit-Position: refs/heads/master@{#478034}
1 file changed