Apply container offset and scroll between transform and container perspective.

third_party/WebKit/Source/core/layout/LayoutBox.h

Index: third_party/WebKit/Source/core/layout/LayoutBox.h
diff --git a/third_party/WebKit/Source/core/layout/LayoutBox.h b/third_party/WebKit/Source/core/layout/LayoutBox.h
index 26bc75568a1abc63ad0ecde58bbe045a0772e818..78cd43ba47fff7c7fe4a94db590cafe39267fd16 100644
--- a/third_party/WebKit/Source/core/layout/LayoutBox.h
+++ b/third_party/WebKit/Source/core/layout/LayoutBox.h
@@ -1257,6 +1257,22 @@ class CORE_EXPORT LayoutBox : public LayoutBoxModelObject {
       TransformState::TransformAccumulation,
       VisualRectFlags = kDefaultVisualRectFlags) const;
 
+  // Applies the box clip. This is like mapScrollingContentsRectToBoxSpace,
+  // except it does not apply scroll.
+  bool ApplyBoxClips(TransformState&,
+                     TransformState::TransformAccumulation,
+                     VisualRectFlags) const;
+
+  // Maps the visual rect state |transformState| from this box into its
+  // container, applying adjustments for the given container offset,
+  // scrolling, container clipping, and transform (including container
+  // perspective).
+  bool MapVisualRectToContainer(const LayoutObject* container_bject,
+                                const LayoutPoint& container_offset,
+                                const LayoutObject* ancestor,
+                                VisualRectFlags,
+                                TransformState&) const;
+
   virtual bool HasRelativeLogicalWidth() const;
   virtual bool HasRelativeLogicalHeight() const;