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Modifying CustomFrameView to layout window controls based on user configurations. For linux begin observing the configs and changes. For other systems fall back on a default ordering.

Update tests that were originally missed.

Original review: https://codereview.chromium.org/240163006/
Revert review: https://codereview.chromium.org/276173002/
Revert "Revert of Linux Aura Task Manager Frame Buttons Misaligned (https://codereview.chromium.org/240163006/)"

This reverts commit 9031ef57.

TEST=CustomFrameViewTest
BUG=351917

Review URL: https://codereview.chromium.org/281353009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@272352 0039d316-1c4b-4281-b951-d872f2087c98