Clean compositing inputs for location APIs for sticky-affected elements.

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

Index: third_party/WebKit/Source/core/dom/Document.h
diff --git a/third_party/WebKit/Source/core/dom/Document.h b/third_party/WebKit/Source/core/dom/Document.h
index 9b0ab6e6ced219e4f512f65ba15156b7e9a98393..42d4d30d7836df4ae0e6b93008eef33cf3155d24 100644
--- a/third_party/WebKit/Source/core/dom/Document.h
+++ b/third_party/WebKit/Source/core/dom/Document.h
@@ -513,6 +513,10 @@ class CORE_EXPORT Document : public ContainerNode,
   PassRefPtr<ComputedStyle> StyleForElementIgnoringPendingStylesheets(Element*);
   PassRefPtr<ComputedStyle> StyleForPage(int page_index);
 
+  // Ensure that the document lifecycle is in a valid state to call
+  // location-based APIs on a given node, advancing the lifecycle if not.
+  void EnsureLifecycleValidForLocationAPIsForNode(const Node*);
+
   // Returns true if page box (margin boxes and page borders) is visible.
   bool IsPageBoxVisible(int page_index);