Make all gesture scrolls use customization path internally

third_party/WebKit/LayoutTests/fast/scroll-behavior/scroll-customization/scrollstate-distribute-to-scroll-chain-descendant.html

Index: third_party/WebKit/LayoutTests/fast/scroll-behavior/scroll-customization/scrollstate-distribute-to-scroll-chain-descendant.html
diff --git a/third_party/WebKit/LayoutTests/fast/scroll-behavior/scroll-customization/scrollstate-distribute-to-scroll-chain-descendant.html b/third_party/WebKit/LayoutTests/fast/scroll-behavior/scroll-customization/scrollstate-distribute-to-scroll-chain-descendant.html
index 588c2ac440e169db3846ae6f40dbdcabae81ec89..0bd6d4ddbb8e0a0addd5e2689fb4323ff2a45faf 100644
--- a/third_party/WebKit/LayoutTests/fast/scroll-behavior/scroll-customization/scrollstate-distribute-to-scroll-chain-descendant.html
+++ b/third_party/WebKit/LayoutTests/fast/scroll-behavior/scroll-customization/scrollstate-distribute-to-scroll-chain-descendant.html
@@ -33,7 +33,7 @@ for (var i = 0; i < elementCount; ++i) {
 
 if ('ScrollState' in window && window.internals) {
   test(function() {
-    var scrollState = new ScrollState({deltaX: 100});
+    var scrollState = new ScrollState({deltaX: 100, isDirectManipulation: true});
     window.internals.setScrollChain(scrollState, elements);
     scrollState.distributeToScrollChainDescendant();
     assert_equals(0, remainingNumberOfTimesToBeCalled);
@@ -43,7 +43,7 @@ if ('ScrollState' in window && window.internals) {
   }, "distributeToScrollChainDescendant propagates correctly.");
 
   test(function() {
-    var scrollState = new ScrollState({deltaX: 100});
+    var scrollState = new ScrollState({deltaX: 100, isDirectManipulation: true});
     window.internals.setScrollChain(scrollState, []);
     assert_equals(0, remainingNumberOfTimesToBeCalled);
     scrollState.distributeToScrollChainDescendant();