Fix a bogus assertion in CLM

Fix a bogus assertion in CLM

In the CompositedLayerMapping's doPaintTask function we ASSERT that
we never get here if we paint into our composited ancestor (i.e., we
don't paint ourself). This doesn't make sense for the squashing layer.
Even if the layer that owns the backing happens to paint into its
ancestor, the squashed layers may well paint into the squashing layer.

BUG=394413
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=180328

[abarth-chromium, 2014-08-14 20:56:02]

LGTM

[abarth-chromium, 2014-08-14 20:56:29]

https://codereview.chromium.org/476583002/diff/80001/Source/core/rendering/co...
File Source/core/rendering/compositing/CompositedLayerMapping.cpp (right):

https://codereview.chromium.org/476583002/diff/80001/Source/core/rendering/co...
Source/core/rendering/compositing/CompositedLayerMapping.cpp:2022: }
We should just make this a RELEASE_ASSERT

[Ian Vollick, 2014-08-15 03:00:38]

On 2014/08/14 20:56:29, abarth wrote:
>
https://codereview.chromium.org/476583002/diff/80001/Source/core/rendering/co...
> File Source/core/rendering/compositing/CompositedLayerMapping.cpp (right):
> 
>
https://codereview.chromium.org/476583002/diff/80001/Source/core/rendering/co...
> Source/core/rendering/compositing/CompositedLayerMapping.cpp:2022: }
> We should just make this a RELEASE_ASSERT

Done.

[Ian Vollick, 2014-08-15 03:00:41]

The CQ bit was checked by vollick@chromium.org

[commit-bot: I haz the power, 2014-08-15 03:01:45]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/vollick@chromium.org/476583002/120001

[commit-bot: I haz the power, 2014-08-15 04:21:54]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  win_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/win_blink_rel/builds/22871)

[commit-bot: I haz the power, 2014-08-15 05:43:27]

Committed patchset #4 (120001) as 180328