GeometryMapper: Support computing visual rects in spaces that are not direct ancestors.

third_party/WebKit/Source/platform/graphics/paint/TransformPaintPropertyNode.h

Index: third_party/WebKit/Source/platform/graphics/paint/TransformPaintPropertyNode.h
diff --git a/third_party/WebKit/Source/platform/graphics/paint/TransformPaintPropertyNode.h b/third_party/WebKit/Source/platform/graphics/paint/TransformPaintPropertyNode.h
index 0bef99ee629614eaf4044374528e81fd3c151030..1272dc1e1d184531b1dd1354bad85f60265a051f 100644
--- a/third_party/WebKit/Source/platform/graphics/paint/TransformPaintPropertyNode.h
+++ b/third_party/WebKit/Source/platform/graphics/paint/TransformPaintPropertyNode.h
@@ -31,9 +31,13 @@ public:
 
     // Parent transform that this transform is relative to, or nullptr if this
     // is the root transform.
-    const TransformPaintPropertyNode* parent() const { return m_parent.get(); }
+    TransformPaintPropertyNode* parent() const { return m_parent.get(); }
+
+    // Do not use this method if possible, use parent() instead, to preserve const-ness.
+    PassRefPtr<TransformPaintPropertyNode> parentRef() const { return m_parent; }

[chrishtr, 2016/06/30 16:49:55]

Needed so that we can store a refptr to a parent in a PropertyTreeState, which
happens when passing to the
least-common-ancestor.

[pdr., 2016/06/30 21:21:50]

This doesn't appear to be used in this patch.

[chrishtr, 2016/07/01 17:52:24]

Removed. The test was crashing due to refptr counting, then I added this to fix
it, but it's now not crashing any more. I can easily re-add later if needed.

 
 private:
+
     TransformPaintPropertyNode(const TransformationMatrix& matrix, const FloatPoint3D& origin, PassRefPtr<TransformPaintPropertyNode> parent)
         : m_matrix(matrix), m_origin(origin), m_parent(parent) { }