ozone: choose a card useful for display rather than by default

ui/ozone/platform/dri/ozone_platform_gbm.cc

Index: ui/ozone/platform/dri/ozone_platform_gbm.cc
diff --git a/ui/ozone/platform/dri/ozone_platform_gbm.cc b/ui/ozone/platform/dri/ozone_platform_gbm.cc
index bfba0e04851c35aed77d8292a661b4df80060e5f..cd030c1da620c116384f71176e9ba8a0b590e1a1 100644
--- a/ui/ozone/platform/dri/ozone_platform_gbm.cc
+++ b/ui/ozone/platform/dri/ozone_platform_gbm.cc
@@ -47,8 +47,6 @@ namespace ui {
 
 namespace {
 
-const char kDefaultGraphicsCardPath[] = "/dev/dri/card0";
-
 class GlApiLoader {
  public:
   GlApiLoader()
@@ -152,7 +150,7 @@ class OzonePlatformGbm : public OzonePlatform {
   void InitializeGPU() override {
     gl_api_loader_.reset(new GlApiLoader());
     // Async page flips are supported only on surfaceless mode.
-    gbm_.reset(new GbmWrapper(kDefaultGraphicsCardPath));
+    gbm_.reset(new GbmWrapper(NULL));
     gbm_->Initialize();
     buffer_generator_.reset(new GbmBufferGenerator());
     screen_manager_.reset(