[ozone/wayland] Don't use RGBA8 or RGBX8 when running on ChromiumOS.

In particular, the RGBX8 format doesn't seem to be supported. RGBA
ordering support also seems to vary depending on device.

Bug: 1127558
Test: can launch lacros
Change-Id: Iff175b455444b6cfc3cc5c487080b5d42a4b2bc1
Fixed: 2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2409532
Commit-Queue: Eliot Courtney <edcourtney@chromium.org>
Reviewed-by: Robert Kroeger <rjkroege@chromium.org>
Cr-Commit-Position: refs/heads/master@{#806602}

ui/ozone/platform/wayland/host/wayland_screen.cc

@@ -8,6 +8,8 @@
 #include <vector>
 
 #include "base/stl_util.h"
+#include "build/build_config.h"
+#include "build/chromeos_buildflags.h"
 #include "ui/display/display.h"
 #include "ui/display/display_finder.h"
 #include "ui/display/display_list.h"
@@ -37,14 +39,19 @@ WaylandScreen::WaylandScreen(WaylandConnection* connection)
       connection_->buffer_manager_host()->GetSupportedBufferFormats();
   for (const auto& buffer_format : buffer_formats) {
     auto format = buffer_format.first;
-    // RGBA_8888 is the preferred format.
+
+    // TODO(crbug.com/1127822): Investigate a better fix for this.
+#if !BUILDFLAG(IS_LACROS)
+    // RGBA_8888 is the preferred format, except when running on ChromiumOS. See
+    // crbug.com/1127558.
     if (format == gfx::BufferFormat::RGBA_8888)
       image_format_alpha_ = gfx::BufferFormat::RGBA_8888;
-    if (!image_format_alpha_ && format == gfx::BufferFormat::BGRA_8888)
-      image_format_alpha_ = gfx::BufferFormat::BGRA_8888;
-
     if (format == gfx::BufferFormat::RGBX_8888)
       image_format_no_alpha_ = format;
+#endif  // !BUILDFLAG(IS_LACROS)
+
+    if (!image_format_alpha_ && format == gfx::BufferFormat::BGRA_8888)
+      image_format_alpha_ = gfx::BufferFormat::BGRA_8888;
 
     if (image_format_alpha_ && image_format_no_alpha_)
       break;