ozone: gbm: Fail earlier if device can't be opened

ui/ozone/platform/dri/dri_wrapper.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 "ui/ozone/platform/dri/dri_wrapper.h"
 
 #include <fcntl.h>
 #include <sys/mman.h>
 #include <unistd.h>
 #include <xf86drm.h>
@@ skipping 43 matching lines @@
 
 void DrmDestroyDumbBuffer(int fd, uint32_t handle) {
   struct drm_mode_destroy_dumb destroy_request;
   memset(&destroy_request, 0, sizeof(destroy_request));
   destroy_request.handle = handle;
   drmIoctl(fd, DRM_IOCTL_MODE_DESTROY_DUMB, &destroy_request);
 }
 
 }  // namespace
 
-DriWrapper::DriWrapper(const char* device_path) {
-  fd_ = open(device_path, O_RDWR | O_CLOEXEC);
+DriWrapper::DriWrapper(const char* device_path)
+    : fd_(-1), device_path_(device_path) {
 }
 
 DriWrapper::~DriWrapper() {
   if (fd_ >= 0)
     close(fd_);
 }
 
+void DriWrapper::Initialize() {
+  fd_ = open(device_path_, O_RDWR | O_CLOEXEC);
+  if (fd_ < 0)
+    PLOG(FATAL) << "open: " << device_path_;
+}
+
 ScopedDrmCrtcPtr DriWrapper::GetCrtc(uint32_t crtc_id) {
   DCHECK(fd_ >= 0);
   return ScopedDrmCrtcPtr(drmModeGetCrtc(fd_, crtc_id));
 }
 
 bool DriWrapper::SetCrtc(uint32_t crtc_id,
                          uint32_t framebuffer,
                          std::vector<uint32_t> connectors,
                          drmModeModeInfo* mode) {
   DCHECK(fd_ >= 0);
@@ skipping 202 matching lines @@
                                    uint32_t stride,
                                    void* pixels) {
   DCHECK(fd_ >= 0);
   TRACE_EVENT1("dri", "DriWrapper::DestroyDumbBuffer", "handle", handle);
   munmap(pixels, info.getSafeSize(stride));
   DrmDestroyDumbBuffer(fd_, handle);
 }
 
 
 }  // namespace ui