Semantics node merging

Fixes: 129301784
Fixes: 125702443
Fixes: 138173101
Fixes: 142820881
Bug: 142912912
Test: Existing tests pass
Change-Id: Ic72711111495ee5fedfc247bab381c0255572add

diff --git a/ui/ui-unit/api/public_plus_experimental_current.txt b/ui/ui-unit/api/public_plus_experimental_current.txt
index c7e6484..a992471 100644
--- a/ui/ui-unit/api/public_plus_experimental_current.txt
+++ b/ui/ui-unit/api/public_plus_experimental_current.txt

@@ -411,6 +411,7 @@
   }
 
   public final class PxKt {
+    method public static inline androidx.ui.unit.PxBounds PxBounds(androidx.ui.unit.PxPosition topLeft, androidx.ui.unit.PxSize size);
     method public static inline androidx.ui.unit.PxPosition PxPosition(androidx.ui.unit.Px x, androidx.ui.unit.Px y);
     method public static inline androidx.ui.unit.PxSize PxSize(androidx.ui.unit.Px width, androidx.ui.unit.Px height);
     method public static androidx.ui.unit.PxPosition center(androidx.ui.unit.PxSize);