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-----------------Reland 2 Description------------------
Turned on layers for the test for fullscreen windows.

-----------------Reland 1 Description------------------
Reland 1 link: https://codereview.chromium.org/393933003/
Core animation was turned on in M35. The fullscreen window was not layer
backed, but should have been. This original CL exposed this bug.

-----------------Original Description------------------
Original CL link: https://codereview.chromium.org/379293003/

In OSX 10.10+, all views must be added to the NSWindow's contentView. Some
views (like the tab strip and the profile icon) are placed on top of the title
bar and require special treatment. All other views are added as subviews of
'chromeContentView' in TabWindowController. This allows tab dragging and
fullscreen logic to easily move the views that don't need special treatment.

This CL also removes the instances where a VersionIndependentWindow's
contentView gets replaced by setContentView:. Instead, the 'chromeContentView'
gets passed around as a subview. This allows VersionIndependentWindow to remove
another of its internal hacks.

BUG=392239

Review URL: https://codereview.chromium.org/399803002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@283650 0039d316-1c4b-4281-b951-d872f2087c98