exo: Disable RGBX fullscreen overlays.

components/exo/display.cc

Index: components/exo/display.cc
diff --git a/components/exo/display.cc b/components/exo/display.cc
index 4d51b34c49e0b5566f2ef760f2480a542d2c319d..76f5df3517cf39b5bdf51a4a5f0946217350c453 100644
--- a/components/exo/display.cc
+++ b/components/exo/display.cc
@@ -90,8 +90,8 @@ std::unique_ptr<Buffer> Display::CreateLinuxDMABufBuffer(
 
   // List of overlay formats that are known to be supported.
   // TODO(reveman): Determine this at runtime.
-  const gfx::BufferFormat kOverlayFormats[] = {gfx::BufferFormat::RGBA_8888,
-                                               gfx::BufferFormat::RGBX_8888};
+  // TODO(dcastagna): Re-add RGBX_8888 format.
+  const gfx::BufferFormat kOverlayFormats[] = {gfx::BufferFormat::RGBA_8888};
   bool is_overlay_candidate =
       std::find(std::begin(kOverlayFormats), std::end(kOverlayFormats),
                 format) != std::end(kOverlayFormats);