When destroying a resource, register "only" the clients who are losing their resource as having pending resources

[Said Abou-Hallawa]

In <http://trac.webkit.org/changeset/95047>, we tried to fix this issue. But instead of registering the clients of the destroyed resource, we registered all the clients in the cache as having pending resources.

In SVGResourcesCache::resourceDestroyed(), we call resourcesCacheFromRenderer() which returns a cache that maps <RenderElement, SVGResources>.
We loop through all the elements in the cache and we call SVGResources::resourceDestroyed() which will remove the reference to the destroyed resource if it's one of the resources of SVGResources
Then we call SVGDocumentExtensions::addPendingResource() with the ID of the destroyed resource and the Element of the RenderElement.

This is wrong if the SVGResources does not have a reference to the destroyed resource. It is waste of time to register the Element of the RenderElement to have a pending resources in this caae.

[Said Abou-Hallawa]

Created attachment 324358 [details]
Patch

[Said Abou-Hallawa]

<rdar://problem/35064781>

[Simon Fraser (smfr)]

Comment on attachment 324358 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=324358&action=review

> Source/WebCore/rendering/svg/SVGResources.cpp:391
>              m_clipperFilterMaskerData->masker = 0;

These 0 should all be nullptr, right?

> Source/WebCore/rendering/svg/SVGResources.h:70
> +    bool resourceDestroyed(RenderSVGResourceContainer&);

Please add a comment saying what the return value means, or use an enum.

[Said Abou-Hallawa]

Created attachment 324424 [details]
Patch

[WebKit Commit Bot]

Comment on attachment 324424 [details]
Patch

Clearing flags on attachment: 324424

Committed r223789: <https://trac.webkit.org/changeset/223789>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.