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Separated window state change methods into ShellSurface and ClientControlledShellSurface

Bug: 809488
Change-Id: Ifec29e7a7ce2df0dd3b3c4a606479682d9f60dc2
Reviewed-on: https://chromium-review.googlesource.com/814835
Commit-Queue: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: David Reveman <reveman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#523233}