X11: Use CopyFromParent colormap when possible (Reland)

ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc

Index: ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc
diff --git a/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc b/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc
index c47052dd8a586d4edc2409ab58d3ba3a383546c9..8550a320597fcfb3523519e2c4417b93961a85f6 100644
--- a/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc
+++ b/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc
@@ -1376,8 +1376,10 @@ void DesktopWindowTreeHostX11::InitX11Window(
       enable_transparent_visuals, &visual, &depth, &colormap,
       &use_argb_visual_);
 
-  attribute_mask |= CWColormap;
-  swa.colormap = colormap;
+  if (colormap != CopyFromParent) {
+    attribute_mask |= CWColormap;
+    swa.colormap = colormap;
+  }
 
   // x.org will BadMatch if we don't set a border when the depth isn't the
   // same as the parent depth.