Move tiling up into SampleWindow.

Now the tiles do not move with the view, and tiling persists when changing slides.

Review URL: https://codereview.appspot.com/6450143

git-svn-id: http://skia.googlecode.com/svn/trunk@5146 2bbb7eff-a529-9590-31e7-b0007b416f81
3 files changed