SVG: Items inserted into list should be made a tear-off.
Before this patch, static SVGPropertyTearOff items inserted into a SVGListTearOff were not marked as a tear-off.
For such items, |svgAttributeChanged| was not dispatched to its context element, and view was not updated when its value changed.
This patch fixes the issue by converting a static tear-off inserted into a list to a dynamic tear-off.
Also this patch fixes an issue that a tearoff returned from replaceItem/removeItem was still attached to the list.
BUG=
380546,
380176
Committed:
https://src.chromium.org/viewvc/blink?view=rev&revision=176284