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..51f61da7a717ae731a1e8e80e8b4a157c72c5374 100644
--- a/third_party/WebKit/Source/core/dom/Document.h
+++ b/third_party/WebKit/Source/core/dom/Document.h
@@ -513,6 +513,16 @@ class CORE_EXPORT Document : public ContainerNode,
   PassRefPtr<ComputedStyle> StyleForElementIgnoringPendingStylesheets(Element*);
   PassRefPtr<ComputedStyle> StyleForPage(int page_index);
 
+  // Ensures that location-based data will be valid for a given node.
+  //
+  // This will involve running style and layout if they are currently dirty, and
+  // it may also run compositing inputs as well if the node is in a sticky
+  // subtree (as the sticky offset may change the node's position).
+  //
+  // Due to this you should only call this if you definitely need valid location
+  // data, otherwise use one of the |UpdateStyleAndLayout...| methods above.
+  void EnsureAuxiliaryLocationDataValidForNode(const Node*);
+
   // Returns true if page box (margin boxes and page borders) is visible.
   bool IsPageBoxVisible(int page_index);