exo:wayland:clients: Force the use of --use-drm flag

This test requires the --use-drm flag otherwise it
segfault when calling into the gbm buffer management apis.

BUG: None
TEST= wayland_color_space --use-drm=i915|amdgpu
Signed-off-by: Carlos Santa <carlos.santa@intel.com>
Change-Id: I7ec7032fcc6f93f78bdd3e36b270567cf320f549
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2384329
Commit-Queue: Daniele Castagna <dcastagna@chromium.org>
Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Reviewed-by: J Kardatzke <jkardatzke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#803865}

AUTHORS

@@ -167,6 +167,7 @@ Caio Marcelo de Oliveira Filho <caio.de.oliveira.filho@intel.com>
 Caitlin Potter <caitpotter88@gmail.com>
 Calvin Mei <calvimei@amazon.com>
 Cameron Gutman <aicommander@gmail.com>
+Carlos Santa <carlos.santa@intel.com>
 Catalin Badea <badea@adobe.com>
 Cathie Chen <cathiechen@tencent.com>
 Cem Kocagil <cem.kocagil@gmail.com>

components/exo/wayland/clients/color_space.cc

@@ -232,6 +232,12 @@ int main(int argc, char* argv[]) {
     }
   }
 
+  if (!params.use_drm) {
+    LOG(ERROR) << "Missing --use-drm parameter which is required for gbm "
+                 "buffer allocation";
+    return 1;
+  }
+
   params.drm_format = DRM_FORMAT_ARGB8888;
   params.bo_usage =
       GBM_BO_USE_SCANOUT | GBM_BO_USE_LINEAR | GBM_BO_USE_TEXTURING;