Test framework and tests for CSSOM View smooth scroll

LayoutTests/fast/scroll-behavior/main-frame-scrollTo-expected.txt

Index: LayoutTests/fast/scroll-behavior/main-frame-scrollTo-expected.txt
diff --git a/LayoutTests/fast/scroll-behavior/main-frame-scrollTo-expected.txt b/LayoutTests/fast/scroll-behavior/main-frame-scrollTo-expected.txt
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+++ b/LayoutTests/fast/scroll-behavior/main-frame-scrollTo-expected.txt
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+Test that calling scrollTo on the main frame works with both scroll behaviors
+
+This is a testharness.js-based test.
+PASS Scroll to x:1, y:2, smooth:false 
+PASS Scroll to x:2, y:3, smooth:false 
+PASS Scroll to x:3, y:4, smooth:false 
+PASS Scroll to x:4, y:5, smooth:false 
+FAIL Scroll to x:10, y:15, smooth:true assert_equals: expected "4, 5" but got "10, 15"
+FAIL Scroll to x:20, y:25, smooth:true assert_equals: expected "10, 15" but got "20, 25"
+FAIL Scroll to x:30, y:35, smooth:true assert_equals: expected "20, 25" but got "30, 35"
+FAIL Scroll to x:40, y:45, smooth:true assert_equals: expected "30, 35" but got "40, 45"
+FAIL Scroll to x:4000, y:4100, smooth:true assert_equals: expected "40, 45" but got "4000, 4100"
+FAIL Scroll to x:15, y:20, smooth:true assert_equals: expected "4000, 4100" but got "15, 20"
+FAIL Scroll to x:4100, y:4000, smooth:true assert_equals: expected "15, 20" but got "4100, 4000"
+FAIL Scroll to x:10, y:5, smooth:true assert_equals: expected "4100, 4000" but got "10, 5"
+Harness: the test ran to completion.
+