Revert of Catch up the spec update in CSS Rhythmic Sizing

third_party/WebKit/Source/core/css/resolver/StyleBuilderCustom.cpp

Index: third_party/WebKit/Source/core/css/resolver/StyleBuilderCustom.cpp
diff --git a/third_party/WebKit/Source/core/css/resolver/StyleBuilderCustom.cpp b/third_party/WebKit/Source/core/css/resolver/StyleBuilderCustom.cpp
index 2eb7a947b75d72f0c8b0dfb065b35c763953a2f1..621e4e3071fdb9e8a4c1356b1cb417d4aa00fab6 100644
--- a/third_party/WebKit/Source/core/css/resolver/StyleBuilderCustom.cpp
+++ b/third_party/WebKit/Source/core/css/resolver/StyleBuilderCustom.cpp
@@ -424,6 +424,42 @@
   }
   state.style()->setPageSizeType(pageSizeType);
   state.style()->setPageSize(size);
+}
+
+void StyleBuilderFunctions::applyInitialCSSPropertySnapHeight(
+    StyleResolverState& state) {
+  state.style()->setSnapHeightUnit(0);
+  state.style()->setSnapHeightPosition(0);
+}
+
+void StyleBuilderFunctions::applyInheritCSSPropertySnapHeight(
+    StyleResolverState& state) {
+  state.style()->setSnapHeightUnit(state.parentStyle()->snapHeightUnit());
+  state.style()->setSnapHeightPosition(
+      state.parentStyle()->snapHeightPosition());
+}
+
+void StyleBuilderFunctions::applyValueCSSPropertySnapHeight(
+    StyleResolverState& state,
+    const CSSValue& value) {
+  const CSSValueList& list = toCSSValueList(value);
+  const CSSPrimitiveValue& first = toCSSPrimitiveValue(list.item(0));
+  DCHECK(first.isLength());
+  int unit = first.computeLength<int>(state.cssToLengthConversionData());
+  DCHECK_GE(unit, 0);
+  state.style()->setSnapHeightUnit(clampTo<uint8_t>(unit));
+
+  if (list.length() == 1) {
+    state.style()->setSnapHeightPosition(0);
+    return;
+  }
+
+  DCHECK_EQ(list.length(), 2U);
+  const CSSPrimitiveValue& second = toCSSPrimitiveValue(list.item(1));
+  DCHECK(second.isNumber());
+  int position = second.getIntValue();
+  DCHECK(position > 0 && position <= 100);
+  state.style()->setSnapHeightPosition(position);
 }
 
 void StyleBuilderFunctions::applyValueCSSPropertyTextAlign(