Introduce Property Trees

ui/gfx/transform.h

Index: ui/gfx/transform.h
diff --git a/ui/gfx/transform.h b/ui/gfx/transform.h
index eeb66206afaedb7a7074d4bada5b38a41ccb955d..85bab6949cf36b8160270eb3f2c40897d907db68 100644
--- a/ui/gfx/transform.h
+++ b/ui/gfx/transform.h
@@ -122,6 +122,11 @@ class GFX_EXPORT Transform {
   // Returns true if the matrix is either identity or pure translation.
   bool IsIdentityOrTranslation() const { return matrix_.isTranslate(); }
 
+  // Returns true if the matrix is either the identity or a 2d translation.
+  bool IsIdentityOr2DTranslation() const {
+    return matrix_.isTranslate() && matrix_.get(2, 3) == 0;
+  }
+
   // Returns true if the matrix is either identity or pure translation,
   // allowing for an amount of inaccuracy as specified by the parameter.
   bool IsApproximatelyIdentityOrTranslation(SkMScalar tolerance) const;