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 04d7cdcdbc9c1b6652df120a152158b1a2b5b80d..0276381d9115b9a6cb5ed0c44bf19074e06cc3f3 100644
--- a/third_party/WebKit/Source/core/dom/Document.h
+++ b/third_party/WebKit/Source/core/dom/Document.h
@@ -514,6 +514,16 @@ 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 run style and layout if they are currently dirty, and it may also
+  // run compositing inputs 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 EnsurePaintLocationDataValidForNode(const Node*);
+
   // Returns true if page box (margin boxes and page borders) is visible.
   bool IsPageBoxVisible(int page_index);