Test framework and tests for CSSOM View smooth scroll

LayoutTests/fast/scroll-behavior/subframe-scrollBy-expected.txt

Index: LayoutTests/fast/scroll-behavior/subframe-scrollBy-expected.txt
diff --git a/LayoutTests/fast/scroll-behavior/subframe-scrollBy-expected.txt b/LayoutTests/fast/scroll-behavior/subframe-scrollBy-expected.txt
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+++ b/LayoutTests/fast/scroll-behavior/subframe-scrollBy-expected.txt
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+Test that calling scrollBy on a subframe works with both scroll behaviors
+
+
+This is a testharness.js-based test.
+PASS Scroll x:1, y:2, smooth:false 
+PASS Scroll x:2, y:3, smooth:false 
+PASS Scroll x:3, y:4, smooth:false 
+PASS Scroll x:4, y:5, smooth:false 
+FAIL Scroll x:10, y:15, smooth:true assert_equals: expected "10, 14" but got "20, 29"
+FAIL Scroll x:20, y:25, smooth:true assert_equals: expected "20, 29" but got "40, 54"
+FAIL Scroll x:30, y:35, smooth:true assert_equals: expected "40, 54" but got "70, 89"
+FAIL Scroll x:40, y:45, smooth:true assert_equals: expected "70, 89" but got "110, 134"
+FAIL Scroll x:4000, y:4100, smooth:true assert_equals: expected "110, 134" but got "4110, 4234"
+FAIL Scroll x:-3900, y:-3850, smooth:true assert_equals: expected "4110, 4234" but got "210, 384"
+FAIL Scroll x:4050, y:4000, smooth:true assert_equals: expected "210, 384" but got "4260, 4384"
+FAIL Scroll x:-4000, y:-4100, smooth:true assert_equals: expected "4260, 4384" but got "260, 284"
+Harness: the test ran to completion.
+