Remove TiledBacking / TileCache code

Remove TiledBacking / TileCache code

We don't use this. All composited layers are tiled if necessary in a way that's
invisible to WebCore.

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=147978

[jamesr, 2013-04-09 21:07:30]

Out it goes!

Ian - I've left behind a few hooks in RenderLayerBacking/RenderLayerCompositor
related to the fixed background layer that may or may not be useful in your
patch.  Once we land your fixed background patch we should make sure to remove
any bits of this we don't need.

[eseidel, 2013-04-09 21:28:54]

lgtm

[commit-bot: I haz the power, 2013-04-09 21:29:09]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/jamesr@chromium.org/13818029/36

[commit-bot: I haz the power, 2013-04-09 21:45:08]

Retried try job too often on linux_layout_rel for step(s) compile,
test_shell_tests, webkit_lint, webkit_tests, webkit_unit_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=linux_layo...

[jamesr, 2013-04-09 21:45:44]

On 2013/04/09 21:29:09, I haz the power (commit-bot) wrote:
> CQ is trying da patch. Follow status at
> https://chromium-status.appspot.com/cq/jamesr%40chromium.org/13818029/36

CQ doesn't work yet since it uses ToT chromium but the DEPS version of Blink,
which is too old to apply patches to.  Will go by hand.  Dirk's fixing it.

[jamesr, 2013-04-09 21:55:47]

Committed patchset #2 manually as r147978 (presubmit successful).