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PhantomWindowController shows two styles of window, STYLE_SHADOW and STYLE_DRAGGING.
Although STYLE_SHADOW is specific to workspace, STYLE_DRAGGING is not specific to
workspace. This CL separates this feature into two classes so that the
STYLE_DRAGGING part can be used from non-workspace specific code

- Extract the STYLE_DRAGGING part from PhantomWindowController into DragWindowController.
- Move the ownership of the copied window layer from WorkspaceWindowResizer to
  DragWindowController.

BUG=156519


Review URL: https://chromiumcodereview.appspot.com/11280283

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@171048 0039d316-1c4b-4281-b951-d872f2087c98