Handle more <length> properties in animation

LayoutTests/animations/interpolation/svg-ry-interpolation-expected.txt

Index: LayoutTests/animations/interpolation/svg-ry-interpolation-expected.txt
diff --git a/LayoutTests/animations/interpolation/svg-ry-interpolation-expected.txt b/LayoutTests/animations/interpolation/svg-ry-interpolation-expected.txt
new file mode 100644
index 0000000000000000000000000000000000000000..61806e3432ba89c0e8624157b2a52ba0eb8c5eef
--- /dev/null
+++ b/LayoutTests/animations/interpolation/svg-ry-interpolation-expected.txt
@@ -0,0 +1,76 @@
+CSS Animations:
+PASS: ry from [0px] to [20px] was [0px] at -0.3
+PASS: ry from [0px] to [20px] was [0px] at 0
+PASS: ry from [0px] to [20px] was [6px] at 0.3
+PASS: ry from [0px] to [20px] was [12px] at 0.6
+PASS: ry from [0px] to [20px] was [20px] at 1
+PASS: ry from [0px] to [20px] was [30px] at 1.5
+PASS: ry from [0px] to [10em] was [0em] at -0.3
+PASS: ry from [0px] to [10em] was [0em] at 0
+PASS: ry from [0px] to [10em] was [3em] at 0.3
+PASS: ry from [0px] to [10em] was [6em] at 0.6
+PASS: ry from [0px] to [10em] was [10em] at 1
+PASS: ry from [0px] to [10em] was [15em] at 1.5
+PASS: ry from [30px] to [10em] was [0px] at -0.3
+PASS: ry from [30px] to [10em] was [30px] at 0
+PASS: ry from [30px] to [10em] was [69px] at 0.3
+PASS: ry from [30px] to [10em] was [108px] at 0.6
+PASS: ry from [30px] to [10em] was [10em] at 1
+PASS: ry from [30px] to [10em] was [225px] at 1.5
+PASS: ry from [10em] to [0px] was [13em] at -0.3
+PASS: ry from [10em] to [0px] was [10em] at 0
+PASS: ry from [10em] to [0px] was [7em] at 0.3
+PASS: ry from [10em] to [0px] was [4em] at 0.6
+PASS: ry from [10em] to [0px] was [0em] at 1
+PASS: ry from [10em] to [0px] was [0em] at 1.5
+PASS: ry from [10em] to [30px] was [199px] at -0.3
+PASS: ry from [10em] to [30px] was [10em] at 0
+PASS: ry from [10em] to [30px] was [121px] at 0.3
+PASS: ry from [10em] to [30px] was [82px] at 0.6
+PASS: ry from [10em] to [30px] was [30px] at 1
+PASS: ry from [10em] to [30px] was [0px] at 1.5
+PASS: ry from [0] to [20] was [0] at -0.3
+PASS: ry from [0] to [20] was [0] at 0
+PASS: ry from [0] to [20] was [6] at 0.3
+PASS: ry from [0] to [20] was [12] at 0.6
+PASS: ry from [0] to [20] was [20] at 1
+PASS: ry from [0] to [20] was [30] at 1.5
+
+Web Animations API:
+PASS: ry from [0px] to [20px] was [0px] at -0.3
+PASS: ry from [0px] to [20px] was [0px] at 0
+PASS: ry from [0px] to [20px] was [6px] at 0.3
+PASS: ry from [0px] to [20px] was [12px] at 0.6
+PASS: ry from [0px] to [20px] was [20px] at 1
+PASS: ry from [0px] to [20px] was [30px] at 1.5
+PASS: ry from [0px] to [10em] was [0em] at -0.3
+PASS: ry from [0px] to [10em] was [0em] at 0
+PASS: ry from [0px] to [10em] was [3em] at 0.3
+PASS: ry from [0px] to [10em] was [6em] at 0.6
+PASS: ry from [0px] to [10em] was [10em] at 1
+PASS: ry from [0px] to [10em] was [15em] at 1.5
+PASS: ry from [30px] to [10em] was [0px] at -0.3
+PASS: ry from [30px] to [10em] was [30px] at 0
+PASS: ry from [30px] to [10em] was [69px] at 0.3
+PASS: ry from [30px] to [10em] was [108px] at 0.6
+PASS: ry from [30px] to [10em] was [10em] at 1
+PASS: ry from [30px] to [10em] was [225px] at 1.5
+PASS: ry from [10em] to [0px] was [13em] at -0.3
+PASS: ry from [10em] to [0px] was [10em] at 0
+PASS: ry from [10em] to [0px] was [7em] at 0.3
+PASS: ry from [10em] to [0px] was [4em] at 0.6
+PASS: ry from [10em] to [0px] was [0em] at 1
+PASS: ry from [10em] to [0px] was [0em] at 1.5
+PASS: ry from [10em] to [30px] was [199px] at -0.3
+PASS: ry from [10em] to [30px] was [10em] at 0
+PASS: ry from [10em] to [30px] was [121px] at 0.3
+PASS: ry from [10em] to [30px] was [82px] at 0.6
+PASS: ry from [10em] to [30px] was [30px] at 1
+PASS: ry from [10em] to [30px] was [0px] at 1.5
+PASS: ry from [0] to [20] was [0] at -0.3
+PASS: ry from [0] to [20] was [0] at 0
+PASS: ry from [0] to [20] was [6] at 0.3
+PASS: ry from [0] to [20] was [12] at 0.6
+PASS: ry from [0] to [20] was [20] at 1
+PASS: ry from [0] to [20] was [30] at 1.5
+