Oilpan: non-eagerly trace HTML element stack records.
Oilpan: non-eagerly trace HTML element stack records.

For some parses, the ElementRecord chains kept by the HTML element parse
stack might end up very long, requiring corresponding amounts of call
stack when being traced eagerly.

Use the marking stack instead for these objects, as is done for the
ContainerNodes these record objects refer to.

R=haraken
BUG=420515

Review URL: https://codereview.chromium.org/809803003

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@187808 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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