Figure out the default graphics card on the Browser process

ui/ozone/platform/dri/dri_util.cc

 // 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.
 
 #include "base/strings/stringprintf.h"
 #include "ui/ozone/platform/dri/dri_util.h"
 
 #include <errno.h>
 #include <fcntl.h>
 #include <stdint.h>
@@ skipping 147 matching lines @@
   if (screen_manager->ConfigureDisplayController(
           drm, displays[0]->crtc()->crtc_id,
           displays[0]->connector()->connector_id, gfx::Point(),
           displays[0]->connector()->modes[0])) {
     if (dpms)
       drm->SetProperty(displays[0]->connector()->connector_id, dpms->prop_id,
                        DRM_MODE_DPMS_ON);
   }
 }
 
-base::FilePath GetFirstDisplayCardPath() {
+base::FilePath GetPrimaryDisplayCardPath() {
   struct drm_mode_card_res res;
   for (int i = 0; /* end on first card# that does not exist */; i++) {
     std::string card_path = base::StringPrintf(kDefaultGraphicsCardPattern, i);
 
     if (access(card_path.c_str(), F_OK) != 0)
       break;
 
     int fd = open(card_path.c_str(), O_RDWR | O_CLOEXEC);
     if (fd < 0)
       continue;
 
     memset(&res, 0, sizeof(struct drm_mode_card_res));
     int ret = drmIoctl(fd, DRM_IOCTL_MODE_GETRESOURCES, &res);
     close(fd);
     if (ret == 0 && res.count_crtcs > 0) {
       return base::FilePath(card_path);
     }
   }
 
   return base::FilePath();
 }
 
 }  // namespace ui