Unify the calculation of main thread offset of sticky element

third_party/WebKit/Source/platform/graphics/GraphicsLayer.cpp

Index: third_party/WebKit/Source/platform/graphics/GraphicsLayer.cpp
diff --git a/third_party/WebKit/Source/platform/graphics/GraphicsLayer.cpp b/third_party/WebKit/Source/platform/graphics/GraphicsLayer.cpp
index 1f1931d8df4f240a5b98c7b96955be0ab89e6a7f..d028c4560158a09ae95c228666ea1c3d7f4d3723 100644
--- a/third_party/WebKit/Source/platform/graphics/GraphicsLayer.cpp
+++ b/third_party/WebKit/Source/platform/graphics/GraphicsLayer.cpp
@@ -1097,6 +1097,10 @@ void GraphicsLayer::SetStickyPositionConstraint(
   layer_->Layer()->SetStickyPositionConstraint(sticky_constraint);
 }
 
+void GraphicsLayer::SetStickyMainThreadOffset(const WebSize& offset) {
+  layer_->Layer()->SetStickyMainThreadOffset(offset);
+}
+
 void GraphicsLayer::SetFilterQuality(SkFilterQuality filter_quality) {
   if (image_layer_)
     image_layer_->SetNearestNeighbor(filter_quality == kNone_SkFilterQuality);