Let SVGForeignObject's local SVG coordinates mean what it should

third_party/WebKit/Source/core/layout/svg/LayoutSVGBlock.h

Index: third_party/WebKit/Source/core/layout/svg/LayoutSVGBlock.h
diff --git a/third_party/WebKit/Source/core/layout/svg/LayoutSVGBlock.h b/third_party/WebKit/Source/core/layout/svg/LayoutSVGBlock.h
index 598a56f62704a3c2c694038bf6ff8bedec9b18e4..cfc5c091dfdf82ac65789dfb72ad3500084ea6ea 100644
--- a/third_party/WebKit/Source/core/layout/svg/LayoutSVGBlock.h
+++ b/third_party/WebKit/Source/core/layout/svg/LayoutSVGBlock.h
@@ -26,10 +26,19 @@ namespace blink {
 
 class SVGElement;
 
+// A common class of SVG objects that delegate layout, paint, etc. tasks to
+// LayoutBlockFlow. It has two coordinate spaces:
+// - local SVG coordinate space: similar to LayoutSVGModelObject, the space
+//   that localSVGTransform() applies.
+// - local HTML coordinate space: defined by frameRect() as if the local SVG
+//   coordinate space created a containing block. Like other LayoutBlockFlow
+//   objects, LayoutSVGBlock's frameRect() is also in physical coordinates with
+//   flipped blocks direction in the "containing block".
 class LayoutSVGBlock : public LayoutBlockFlow {
  public:
   explicit LayoutSVGBlock(SVGElement*);
 
+  // These mapping functions map coordinates in HTML spaces.
   void mapLocalToAncestor(const LayoutBoxModelObject* ancestor,
                           TransformState&,
                           MapCoordinatesFlags = ApplyContainerFlip) const final;
@@ -39,6 +48,10 @@ class LayoutSVGBlock : public LayoutBlockFlow {
   const LayoutObject* pushMappingToContainer(
       const LayoutBoxModelObject* ancestorToStopAt,
       LayoutGeometryMap&) const final;
+  bool mapToVisualRectInAncestorSpace(
+      const LayoutBoxModelObject* ancestor,
+      LayoutRect&,
+      VisualRectFlags = DefaultVisualRectFlags) const final;
 
   AffineTransform localSVGTransform() const final { return m_localTransform; }
 
@@ -46,10 +59,6 @@ class LayoutSVGBlock : public LayoutBlockFlow {
 
  protected:
   void willBeDestroyed() override;
-  bool mapToVisualRectInAncestorSpace(
-      const LayoutBoxModelObject* ancestor,
-      LayoutRect&,
-      VisualRectFlags = DefaultVisualRectFlags) const final;
 
   AffineTransform m_localTransform;