Web Animations API: Update interpolation test harness to test element.animate()

LayoutTests/animations/interpolation/border-image-width-interpolation-expected.txt

Index: LayoutTests/animations/interpolation/border-image-width-interpolation-expected.txt
diff --git a/LayoutTests/animations/interpolation/border-image-width-interpolation-expected.txt b/LayoutTests/animations/interpolation/border-image-width-interpolation-expected.txt
index d863f58ac4ca51578b50501b4b93c74da734ffeb..a0ae844a43f6fbb9d88737778d12b651d35ef180 100644
--- a/LayoutTests/animations/interpolation/border-image-width-interpolation-expected.txt
+++ b/LayoutTests/animations/interpolation/border-image-width-interpolation-expected.txt
@@ -1,3 +1,4 @@
+CSS Animations:
 PASS: border-image-width from [0px] to [20px] was [0px] at -0.3
 PASS: border-image-width from [0px] to [20px] was [0px] at 0
 PASS: border-image-width from [0px] to [20px] was [6px] at 0.3
@@ -67,3 +68,73 @@ PASS: border-image-width from [10] to [20%] was [20%] at 0.6
 PASS: border-image-width from [10] to [20%] was [20%] at 1
 PASS: border-image-width from [10] to [20%] was [20%] at 1.5
 
+Web Animations API:
+PASS: borderImageWidth from [0px] to [20px] was [0px] at -0.3
+PASS: borderImageWidth from [0px] to [20px] was [0px] at 0
+PASS: borderImageWidth from [0px] to [20px] was [6px] at 0.3
+PASS: borderImageWidth from [0px] to [20px] was [12px] at 0.6
+PASS: borderImageWidth from [0px] to [20px] was [20px] at 1
+PASS: borderImageWidth from [0px] to [20px] was [30px] at 1.5
+PASS: borderImageWidth from [0px] to [20px] was [100px] at 5
+PASS: borderImageWidth from [0px] to [20px] was [200px] at 10
+PASS: borderImageWidth from [0%] to [20%] was [0%] at -0.3
+PASS: borderImageWidth from [0%] to [20%] was [0%] at 0
+PASS: borderImageWidth from [0%] to [20%] was [6%] at 0.3
+PASS: borderImageWidth from [0%] to [20%] was [12%] at 0.6
+PASS: borderImageWidth from [0%] to [20%] was [20%] at 1
+PASS: borderImageWidth from [0%] to [20%] was [30%] at 1.5
+PASS: borderImageWidth from [0%] to [20%] was [100%] at 5
+PASS: borderImageWidth from [0%] to [20%] was [200%] at 10
+PASS: borderImageWidth from [0] to [20] was [0] at -0.3
+PASS: borderImageWidth from [0] to [20] was [0] at 0
+PASS: borderImageWidth from [0] to [20] was [6] at 0.3
+PASS: borderImageWidth from [0] to [20] was [12] at 0.6
+PASS: borderImageWidth from [0] to [20] was [20] at 1
+PASS: borderImageWidth from [0] to [20] was [30] at 1.5
+PASS: borderImageWidth from [0] to [20] was [100] at 5
+PASS: borderImageWidth from [0] to [20] was [200] at 10
+PASS: borderImageWidth from [10px 20% 30 40px] to [80px 70% 60 50px] was [0px   5%  21  37px] at -0.3
+PASS: borderImageWidth from [10px 20% 30 40px] to [80px 70% 60 50px] was [10px  20%  30  40px] at 0
+PASS: borderImageWidth from [10px 20% 30 40px] to [80px 70% 60 50px] was [31px  35%  39  43px] at 0.3
+PASS: borderImageWidth from [10px 20% 30 40px] to [80px 70% 60 50px] was [52px  50%  48  46px] at 0.6
+PASS: borderImageWidth from [10px 20% 30 40px] to [80px 70% 60 50px] was [80px  70%  60  50px] at 1
+PASS: borderImageWidth from [10px 20% 30 40px] to [80px 70% 60 50px] was [115px  95%  75  55px] at 1.5
+PASS: borderImageWidth from [10px 20% 30 40px] to [80px 70% 60 50px] was [360px 270% 180  90px] at 5
+PASS: borderImageWidth from [10px 20% 30 40px] to [80px 70% 60 50px] was [710px 520% 330 140px] at 10
+FAIL: borderImageWidth from [10%] to [20px] was [calc(13% + -6px)] at -0.3, expected [calc(13% + -6px)] (parsed as [7px])
+PASS: borderImageWidth from [10%] to [20px] was [10%] at 0
+FAIL: borderImageWidth from [10%] to [20px] was [calc(7% + 6px)] at 0.3, expected [calc(7% + 6px)] (parsed as [13px])
+FAIL: borderImageWidth from [10%] to [20px] was [calc(4% + 12px)] at 0.6, expected [calc(4% + 12px)] (parsed as [16px])
+PASS: borderImageWidth from [10%] to [20px] was [20px] at 1
+FAIL: borderImageWidth from [10%] to [20px] was [calc(-5% + 30px)] at 1.5, expected [calc(-5% + 30px)] (parsed as [25px])
+FAIL: borderImageWidth from [10px] to [20%] was [calc(13px + -6%)] at -0.3, expected [calc(13px + -6%)] (parsed as [7px])
+PASS: borderImageWidth from [10px] to [20%] was [10px] at 0
+FAIL: borderImageWidth from [10px] to [20%] was [calc(7px + 6%)] at 0.3, expected [calc(7px + 6%)] (parsed as [13px])
+FAIL: borderImageWidth from [10px] to [20%] was [calc(4px + 12%)] at 0.6, expected [calc(4px + 12%)] (parsed as [16px])
+PASS: borderImageWidth from [10px] to [20%] was [20%] at 1
+FAIL: borderImageWidth from [10px] to [20%] was [calc(-5px + 30%)] at 1.5, expected [calc(-5px + 30%)] (parsed as [25px])
+PASS: borderImageWidth from [10px] to [20] was [10px] at -0.3
+PASS: borderImageWidth from [10px] to [20] was [10px] at 0
+PASS: borderImageWidth from [10px] to [20] was [10px] at 0.3
+PASS: borderImageWidth from [10px] to [20] was [20] at 0.6
+PASS: borderImageWidth from [10px] to [20] was [20] at 1
+PASS: borderImageWidth from [10px] to [20] was [20] at 1.5
+PASS: borderImageWidth from [10] to [20px] was [10] at -0.3
+PASS: borderImageWidth from [10] to [20px] was [10] at 0
+PASS: borderImageWidth from [10] to [20px] was [10] at 0.3
+PASS: borderImageWidth from [10] to [20px] was [20px] at 0.6
+PASS: borderImageWidth from [10] to [20px] was [20px] at 1
+PASS: borderImageWidth from [10] to [20px] was [20px] at 1.5
+PASS: borderImageWidth from [10%] to [20] was [10%] at -0.3
+PASS: borderImageWidth from [10%] to [20] was [10%] at 0
+PASS: borderImageWidth from [10%] to [20] was [10%] at 0.3
+PASS: borderImageWidth from [10%] to [20] was [20] at 0.6
+PASS: borderImageWidth from [10%] to [20] was [20] at 1
+PASS: borderImageWidth from [10%] to [20] was [20] at 1.5
+PASS: borderImageWidth from [10] to [20%] was [10] at -0.3
+PASS: borderImageWidth from [10] to [20%] was [10] at 0
+PASS: borderImageWidth from [10] to [20%] was [10] at 0.3
+PASS: borderImageWidth from [10] to [20%] was [20%] at 0.6
+PASS: borderImageWidth from [10] to [20%] was [20%] at 1
+PASS: borderImageWidth from [10] to [20%] was [20%] at 1.5
+