Revert of cc: Remove tile and scale specific code from raster source

Revert of cc: Remove tile and scale specific code from raster source (patchset #4 id:60001 of https://codereview.chromium.org/811953005/)

Reason for revert:
Broke the build due to collision with crrev.com/820743002.
Probably just needs a rebase and constructor tweak, reverting for now to be safe.

Original issue's description:
> cc: Remove tile and scale specific code from raster source
>
> Fix a TODO I added a while back.  Instead of calling SetMinContentsScale
> and SetTileGridSize directly, pass these as parameters to constructor of the
> PicturePile.
>
> Committed: https://crrev.com/6d1f2981f3204852a9189d0b6e7ad0b18659d68d
> Cr-Commit-Position: refs/heads/master@{#309867}

TBR=vmpstr@chromium.org,hendrikw@chromium.org
NOTREECHECKS=true
NOTRY=true

Committed: https://crrev.com/0dc47d774c6a2f4dd9d5c357c15cc67291f9ebfb
Cr-Commit-Position: refs/heads/master@{#309868}

[jdduke (slow), 2015-01-03 02:05:26]

Created Revert of cc: Remove tile and scale specific code from raster source

[commit-bot: I haz the power, 2015-01-03 02:06:25]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/832963002/1

[commit-bot: I haz the power, 2015-01-03 02:07:15]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-01-03 02:07:57]

Patchset 1 (id:??) landed as
https://crrev.com/0dc47d774c6a2f4dd9d5c357c15cc67291f9ebfb
Cr-Commit-Position: refs/heads/master@{#309868}