Compute snap offsets according to CSS Scroll Snap Spec Level 1

third_party/WebKit/Source/platform/LengthFunctions.h

Index: third_party/WebKit/Source/platform/LengthFunctions.h
diff --git a/third_party/WebKit/Source/platform/LengthFunctions.h b/third_party/WebKit/Source/platform/LengthFunctions.h
index 68d1bf77fdc6b016e200036fba03d5a00708dc69..9abf91886546fa5acbf8458a8febdb871f247c41 100644
--- a/third_party/WebKit/Source/platform/LengthFunctions.h
+++ b/third_party/WebKit/Source/platform/LengthFunctions.h
@@ -28,17 +28,21 @@
 
 namespace blink {
 
+class FloatPoint;
 class FloatSize;
 class LayoutUnit;
 class Length;
 class LengthSize;
 
+struct LengthPoint;
+
 PLATFORM_EXPORT int intValueForLength(const Length&, int maximumValue);
 PLATFORM_EXPORT float floatValueForLength(const Length&, float maximumValue);
 PLATFORM_EXPORT LayoutUnit minimumValueForLength(const Length&, LayoutUnit maximumValue);
 PLATFORM_EXPORT LayoutUnit roundedMinimumValueForLength(const Length&, LayoutUnit maximumValue);
 PLATFORM_EXPORT LayoutUnit valueForLength(const Length&, LayoutUnit maximumValue);
 PLATFORM_EXPORT FloatSize floatSizeForLengthSize(const LengthSize&, const FloatSize& boxSize);
+PLATFORM_EXPORT FloatPoint floatPointForLengthPoint(const LengthPoint&, const FloatSize& boxSize);
 
 } // namespace blink