Force compositing inputs to be clean for getBoundingClientRect

third_party/WebKit/Source/core/dom/Element.h

Index: third_party/WebKit/Source/core/dom/Element.h
diff --git a/third_party/WebKit/Source/core/dom/Element.h b/third_party/WebKit/Source/core/dom/Element.h
index b1d8247167de927328c63ad63f1763a4f38fb5f0..986127c4a8a1cbd0fc97ea5aa016339bfbe33558 100644
--- a/third_party/WebKit/Source/core/dom/Element.h
+++ b/third_party/WebKit/Source/core/dom/Element.h
@@ -801,6 +801,11 @@ class CORE_EXPORT Element : public ContainerNode {
 
   virtual void parserDidSetAttributes() {}
 
+  // Helper method which ensures that compositing inputs have been cleaned.
+  // Cleaning the compositing inputs is required when computing the location of
+  // position:sticky elements or their descendants.
+  void ensureCompositingInputsClean();
+
  private:
   void scrollLayoutBoxBy(const ScrollToOptions&);
   void scrollLayoutBoxTo(const ScrollToOptions&);