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This is roughly how this works.
- Takes the bounds of the edge indicator in screen coords
  and convert to native coords
- If the location of mouse in native coords moves into this
  bounds, we need to warp the mouse.
- Convert the current mouse location in screen coords to the
  destination window's host coords. Adjust so that the location is inside the host window's bounds.

No flag. I'll simply flip the flag if I need to disable this on branch.

BUG=321699,306632
TEST=TBD

Review URL: https://codereview.chromium.org/270863005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@269758 0039d316-1c4b-4281-b951-d872f2087c98