[chromium] CCProxy's shouldn't try to draw if there is no layer renderer

Currently we try and draw, which appears to cause problems when we calculateDrawEtc and don't have a valid set of layerRendererProperties.

Created attachment 139488 [details]
Patch

[WebKit Review Bot]

Attachment 139488 [details] did not pass style-queue:

Failed to run "['Tools/Scripts/check-webkit-style', '--diff-files', u'Source/WebCore/ChangeLog', u'Source/WebCor..." exit_code: 1
Source/WebCore/ChangeLog:8:  You should remove the 'No new tests' and either add and list tests, or explain why no new tests were possible.  [changelog/nonewtests] [5]
Total errors found: 1 in 2 files


If any of these errors are false positives, please file a bug against check-webkit-style.

Created attachment 139493 [details]
Patch

[WebKit Review Bot]

Attachment 139493 [details] did not pass style-queue:

Failed to run "['Tools/Scripts/check-webkit-style', '--diff-files', u'Source/WebCore/ChangeLog', u'Source/WebCor..." exit_code: 1
Source/WebCore/ChangeLog:8:  You should remove the 'No new tests' and either add and list tests, or explain why no new tests were possible.  [changelog/nonewtests] [5]
Total errors found: 1 in 2 files


If any of these errors are false positives, please file a bug against check-webkit-style.

Created attachment 139496 [details]
Patch

Removed assert -- should be valid to try and draw without a renderer. Should just fail.

[Nat Duca]

Comment on attachment 139496 [details]
Patch

What causes this to happen?

Created attachment 139624 [details]
Patch

(In reply to comment #6)
> (From update of attachment 139496 [details])
> What causes this to happen?

I'm not sure. Looking at http://code.google.com/p/chromium/issues/detail?id=125482, it appears the only culprit could be a null renderer. I would also like to know how we get in this state, but in the short term, it would be nice to avoid the crash.

[Adrienne Walker]

Comment on attachment 139624 [details]
Patch

I'm still really confused how this could happen, other than maybe prior to initializeLayerRenderer.

I think canDraw() should also return false in this case so that we don't draw unless forced to.

Created attachment 140068 [details]
Patch

(In reply to comment #8)
> (From update of attachment 139624 [details])
> I'm still really confused how this could happen, other than maybe prior to initializeLayerRenderer.
>
> I think canDraw() should also return false in this case so that we don't draw unless forced to.
Good idea. Done.

[Adrienne Walker]

Comment on attachment 140068 [details]
Patch

R=me.

[WebKit Review Bot]

Comment on attachment 140068 [details]
Patch

Clearing flags on attachment: 140068

Committed r116152: <http://trac.webkit.org/changeset/116152>

[WebKit Review Bot]

All reviewed patches have been landed.  Closing bug.