Enforce minimum visibility only for normal and panel windows
Enforcing minimum visibility is to ensure that the user is always able
to interact with the window. This is only needed for normal and panel
windows which are positioned by user. Other types of windows are
positioned programmatically.
BUG=364117
TEST=WorkspaceLayoutManagerTest.NoMinimumVisibilityForPopupWindows
Review URL: https://codereview.chromium.org/
348943002
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@279630 0039d316-1c4b-4281-b951-d872f2087c98