Apply RTL transform to the background layer

ash/desktop_background/desktop_background_view.cc

Index: ash/desktop_background/desktop_background_view.cc
diff --git a/ash/desktop_background/desktop_background_view.cc b/ash/desktop_background/desktop_background_view.cc
index 43e5f18de83c2bcc000915c9ba8ccc477a4177de..464d802137c21164164bdc7fa02e60d0a4261fbb 100644
--- a/ash/desktop_background/desktop_background_view.cc
+++ b/ash/desktop_background/desktop_background_view.cc
@@ -64,6 +64,9 @@ class LayerControlView : public views::View {
     views::View* child = child_at(0);
     child->SetBounds(0, 0, rounded_size.width(), rounded_size.height());
     gfx::Transform transform;
+    // Apply RTL transform explicitly becacuse Views layer code
+    // doesn't handle RTL.  crbug.com/458753.
+    transform.Translate(-child->GetMirroredX(), 0);
     transform.Scale(ui_scale, ui_scale);
     child->SetTransform(transform);
   }