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

ui/ozone/platform/dri/dri_util.h

 // Copyright 2014 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.
 
 #ifndef UI_OZONE_PLATFORM_DRI_DRI_UTIL_H_
 #define UI_OZONE_PLATFORM_DRI_DRI_UTIL_H_
 
+#include "base/files/file_path.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_vector.h"
 #include "ui/ozone/platform/dri/scoped_drm_types.h"
 
 typedef struct _drmModeModeInfo drmModeModeInfo;
 
 namespace ui {
 
 class DriWrapper;
@@ skipping 26 matching lines @@
 
 // Memory maps a DRM buffer.
 bool MapDumbBuffer(int fd,
                    uint32_t handle,
                    uint32_t size,
                    void** pixels);
 
 void ForceInitializationOfPrimaryDisplay(const scoped_refptr<DriWrapper>& drm,
                                          ScreenManager* screen_manager);
 
+base::FilePath GetFirstDisplayCardPath();
+
 }  // namespace ui
 
 #endif  // UI_OZONE_PLATFORM_DRI_DRI_UTIL_H_