Allow determining if an SVG value has been specified
When checking for the "presence" of a value (if a value has been
specified - either via an attribute or via an animation), using
hasAttribute is not sufficient since if misses if the value is being
animated.
Extend the property interfaces to allow providing an answer to this query.
R=kouhei@chromium.org
TEST=svg/animations/no-attr-*.svg
BUG=330191
Review URL: https://codereview.chromium.org/141793002
git-svn-id: svn://svn.chromium.org/blink/trunk@165537 bbb929c8-8fbe-4397-9dbb-9b2b20218538
56 files changed
