commit 6d8df7c57b4cc1beb9816b7379d88a48650dd507
author fs <fs@opera.com> Tue May 16 00:22:06 2017
committer Commit bot <commit-bot@chromium.org> Tue May 16 00:22:06 2017
tree df9296f914492886e0b220d84ecbcb92b9d401ee
parent ee675c3aea2cccb7547b1b46b848374caef5f6be

Use CorrespondingUseElement() in SVGElement::TreeScopeForIdResolution

For elements sourced non-locally, CorrespondingElement() will give the
TreeScope of the document it was sourced from rather than the TreeScope
of the <use> element. Until we are able to resolve references at
ComputedStyle resolution, attempt to use the host of the shadow tree,
i.e the (outermost) <use> element. (This will not work when external
paint servers are supported, or with a paint server defined in the
referenced document.)

BUG=721167

Review-Url: https://codereview.chromium.org/2877973002
Cr-Commit-Position: refs/heads/master@{#471955}