ui/ozone/drm: Skip vgem before creating gbm device

We want to drop vgem support from minigbm, so filter out the vgem render
node before trying to creating the gbm device to prevent the expected
unsupported backend failure from being treated as a real error.

Bug: b:141278896
Change-Id: Ia68c6fc57cff51cf04d76053026d5ee5ae5c57e0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2392161Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Reviewed-by: Michael Spang <spang@chromium.org>
Commit-Queue: David Stevens <stevensd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805174}

ui/ozone/platform/drm/gpu/gbm_surface_factory.cc

@@ -24,6 +24,7 @@
 #include "ui/ozone/common/egl_util.h"
 #include "ui/ozone/common/gl_ozone_egl.h"
 #include "ui/ozone/platform/drm/common/drm_util.h"
+#include "ui/ozone/platform/drm/common/scoped_drm_types.h"
 #include "ui/ozone/platform/drm/gpu/drm_gpu_util.h"
 #include "ui/ozone/platform/drm/gpu/drm_thread_proxy.h"
 #include "ui/ozone/platform/drm/gpu/drm_window_proxy.h"
@@ -185,18 +186,18 @@ std::vector<gfx::BufferFormat> EnumerateSupportedBufferFormatsForTexturing() {
     if (!dev_path_file.IsValid())
       break;
 
+    // Skip the virtual graphics memory manager device.
+    ScopedDrmVersionPtr version(drmGetVersion(dev_path_file.GetPlatformFile()));
+    if (!version || base::LowerCaseEqualsASCII(version->name, "vgem")) {
+      continue;
+    }
+
     ScopedGbmDevice device(gbm_create_device(dev_path_file.GetPlatformFile()));
     if (!device) {
       LOG(ERROR) << "Couldn't create Gbm Device at " << dev_path.MaybeAsASCII();
       return supported_buffer_formats;
     }
 
-    // Skip the virtual graphics memory manager device.
-    if (base::LowerCaseEqualsASCII(gbm_device_get_backend_name(device.get()),
-                                   "vgem")) {
-      continue;
-    }
-
     for (int i = 0; i <= static_cast<int>(gfx::BufferFormat::LAST); ++i) {
       const gfx::BufferFormat buffer_format = static_cast<gfx::BufferFormat>(i);
       if (base::Contains(supported_buffer_formats, buffer_format))