Revert of Revert of cc: Remove tile rasterize on demand for GPU rasterization

Revert of Revert of cc: Remove tile rasterize on demand for GPU rasterization (patchset #1 id:1 of https://codereview.chromium.org/832353004/)

Reason for revert:
this will conflict with vmpstr's change :(

Original issue's description:
> Revert of cc: Remove tile rasterize on demand for GPU rasterization (patchset #2 id:20001 of https://codereview.chromium.org/842483003/)
>
> Reason for revert:
> Speculative revert for https://code.google.com/p/chromium/issues/detail?id=449288
>
> Original issue's description:
> > cc: Remove tile rasterize on demand for GPU rasterization
> >
> > This code was recently added and isn't needed because it signals to the tile
> > that it should raster on demand (checkerboard), but this will happen anyway with
> > the delgated renderer.
> >
> > I've also removed a test that was breaking due to the change.
> >
> > The test wasn't really testing what we thought, because we wouldn't end up
> > rasterizing anything with GPU, even though force was on.
> >
> > Committed: https://crrev.com/01a4b8027c2e9e678cd6afd0a97bf83807d55f5a
> > Cr-Commit-Position: refs/heads/master@{#311109}
>
> TBR=vmpstr@chromium.org,danakj@chromium.org
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
>
> Committed: https://crrev.com/6bf7f22dd46c31ffcf72e48397edf3ec08533ad5
> Cr-Commit-Position: refs/heads/master@{#311764}

TBR=vmpstr@chromium.org,danakj@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Committed: https://crrev.com/6020325265321d81c9ea4e34fdf6ed718ba300ef
Cr-Commit-Position: refs/heads/master@{#311769}

[hendrikw, 2015-01-15 23:33:34]

Created Revert of Revert of cc: Remove tile rasterize on demand for GPU
rasterization

[commit-bot: I haz the power, 2015-01-15 23:36:06]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/855583002/1

[commit-bot: I haz the power, 2015-01-15 23:38:07]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-01-15 23:39:04]

Patchset 1 (id:??) landed as
https://crrev.com/6020325265321d81c9ea4e34fdf6ed718ba300ef
Cr-Commit-Position: refs/heads/master@{#311769}