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

ui/ozone/platform/dri/ozone_platform_dri.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/ozone/platform/dri/ozone_platform_dri.h"
 
 #include "base/at_exit.h"
 #include "ui/base/cursor/ozone/bitmap_cursor_factory_ozone.h"
 #include "ui/events/ozone/device/device_manager.h"
 #include "ui/events/ozone/evdev/cursor_delegate_evdev.h"
@@ skipping 22 matching lines @@
 #include "ui/events/ozone/layout/xkb/xkb_evdev_codes.h"
 #include "ui/events/ozone/layout/xkb/xkb_keyboard_layout_engine.h"
 #else
 #include "ui/events/ozone/layout/stub/stub_keyboard_layout_engine.h"
 #endif
 
 namespace ui {
 
 namespace {
 
-const char kDefaultGraphicsCardPath[] = "/dev/dri/card0";
-
 // OzonePlatform for Linux DRI (Direct Rendering Infrastructure)
 //
 // This platform is Linux without any display server (no X, wayland, or
 // anything). This means chrome alone owns the display and input devices.
 class OzonePlatformDri : public OzonePlatform {
  public:
   OzonePlatformDri()
-      : dri_(new DriWrapper(base::FilePath(kDefaultGraphicsCardPath))),
+      : dri_(new DriWrapper(GetFirstDisplayCardPath())),
         buffer_generator_(new DriBufferGenerator()),
         screen_manager_(new ScreenManager(buffer_generator_.get())),
         device_manager_(CreateDeviceManager()),
         window_delegate_manager_() {}
   ~OzonePlatformDri() override {}
 
   // OzonePlatform:
   ui::SurfaceFactoryOzone* GetSurfaceFactoryOzone() override {
     return surface_factory_ozone_.get();
   }
@@ skipping 93 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(OzonePlatformDri);
 };
 
 }  // namespace
 
 OzonePlatform* CreateOzonePlatformDri() {
   return new OzonePlatformDri;
 }
 
 }  // namespace ui