Add support for 'href' (w/o XLink NS) for various SVG elements
This CL adds a new wrapper type SVGAnimatedHref that wraps 'href' (the
new, null/default NS version) and '(xlink:)href' (the XLink NS version).
This wrapper type is used by SVGURIReference and thus most uses of
'href' is covered by this part. SVGAnimatedHref is intended as a wrapper
for accessing the underlying value of either 'href' or 'xlink:href'. Any
updates due to setAttribute or will go directly to the underlying values
which means that synchronization etc. does not apply to the wrapper.
This is one of the "pro"s of this approach - it does not require any
modification to synching between the SVGString object and the attribute
in certain cases (like when the "active" attribute is removed). A "con"
would be that there's a lot of dead space in the object since the
wrapper itself still needs to implement the SVGAnimatedString interface
even if just forwards to the actual SVGString.
The UseCounter for href.baseVal/animVal are moved to the new wrapper.
For cases where SVGURIReference is not used, new code-paths are added to
select the right attribute.
Animation code is updated to target the 'href' in the null/default NS.
BUG=584142
Review URL: https://codereview.chromium.org/1681553002
Cr-Commit-Position: refs/heads/master@{#375192}
30 files changed
