[scenic][SCN-1054] Add SetTranslationRH stubs to facilitate rollback of handedness change.

By itself this change is a no-op. The intention is to land this change
underneath fxr/250252 so that if fxr/250252 needs to be rolled back after
dependent changes (e.g. fxr/247814) have landed it can be done so safely.

This will also allow petal changes to land before the fuchsia.git change which
may be desireable as it will reduce exposure to SCN-1054 deprecation warnings.

Change-Id: Idc2e44caf6d727e802a1ec6f0caa3e12678fcee2
diff --git a/sdk/lib/ui/scenic/cpp/resources.h b/sdk/lib/ui/scenic/cpp/resources.h
index ca97187..e9cce53 100644
--- a/sdk/lib/ui/scenic/cpp/resources.h
+++ b/sdk/lib/ui/scenic/cpp/resources.h
@@ -196,6 +196,16 @@
   }
   void SetTranslation(const float translation[3]);
   void SetTranslation(uint32_t variable_id);
+
+  // TODO(SCN-1054) These methods are temporary, remove them.
+  void SetTranslationRH(float tx, float ty, float tz) {
+    SetTranslation(tx, ty, -tz);
+  }
+  void SetTranslationRH(const float translation[3]) {
+    SetTranslation(
+        (float[3]){translation[0], translation[1], -1.0f * translation[2]});
+  }
+
   void SetScale(float sx, float sy, float sz) {
     SetScale((float[3]){sx, sy, sz});
   }