Resizes the fade-in layer bounds.
Resizes the fade-in layer bounds.

Sometimes the root window's bounds may change between the transition.
If the new root window bounds is bigger than the previous, the fade-in
layer covers only a part of the screen.

BUG=164181
TEST=on device, connect an external display and press Ctrl-F4


Review URL: https://chromiumcodereview.appspot.com/12049049

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@179029 0039d316-1c4b-4281-b951-d872f2087c98

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