Shifting layer position for sticky element to avoid passing unnessary variable to cc

third_party/WebKit/Source/core/layout/compositing/CompositedLayerMapping.h

Index: third_party/WebKit/Source/core/layout/compositing/CompositedLayerMapping.h
diff --git a/third_party/WebKit/Source/core/layout/compositing/CompositedLayerMapping.h b/third_party/WebKit/Source/core/layout/compositing/CompositedLayerMapping.h
index a9c13519cf420c4563f226f3eac8055206676a44..a0776749de29875fd686be179fa78c3456d0a053 100644
--- a/third_party/WebKit/Source/core/layout/compositing/CompositedLayerMapping.h
+++ b/third_party/WebKit/Source/core/layout/compositing/CompositedLayerMapping.h
@@ -370,6 +370,10 @@ class CORE_EXPORT CompositedLayerMapping final : public GraphicsLayerClient {
   void UpdateChildClippingMaskLayerGeometry();
   void UpdateStickyConstraints(const ComputedStyle&);
 
+  // This function is determining whether the compositor will be responsible for

[flackr, 2017/06/09 17:49:52]

Sorry, I didn't mean that comment literally. For consistency this should be
written shorter and descriptively - see
https://google.github.io/styleguide/cppguide.html#Function_Comments for
examples.
i.e. Returns true if the compositor will...

[yigu, 2017/06/09 18:06:07]

Done.

+  // applying the sticky position offset for this composited layer.
+  bool UsesCompositedStickyPosition() const;
+
   void CreatePrimaryGraphicsLayer();
   void DestroyGraphicsLayers();