drm: GPU process manages VGEM fd.

ui/ozone/platform/drm/gpu/drm_device.cc

Index: ui/ozone/platform/drm/gpu/drm_device.cc
diff --git a/ui/ozone/platform/drm/gpu/drm_device.cc b/ui/ozone/platform/drm/gpu/drm_device.cc
index 69164431c257ea089585881872abb57d643c85fd..393d5e522ce05b6df97cc69590272a26cb94266c 100644
--- a/ui/ozone/platform/drm/gpu/drm_device.cc
+++ b/ui/ozone/platform/drm/gpu/drm_device.cc
@@ -268,20 +268,15 @@ class DrmDevice::IOWatcher
   DISALLOW_COPY_AND_ASSIGN(IOWatcher);
 };
 
-DrmDevice::DrmDevice(const base::FilePath& device_path)
-    : device_path_(device_path),
-      file_(device_path,
-            base::File::FLAG_OPEN | base::File::FLAG_READ |
-                base::File::FLAG_WRITE),
-      page_flip_manager_(new PageFlipManager()) {
-  LOG_IF(FATAL, !file_.IsValid())
-      << "Failed to open '" << device_path_.value()
-      << "': " << base::File::ErrorToString(file_.error_details());
+DrmDeviceBase::DrmDeviceBase(const base::FilePath& device_path, base::File file)
+    : device_path_(device_path), file_(file.Pass()) {
+}
+
+DrmDeviceBase::~DrmDeviceBase() {
 }
 
 DrmDevice::DrmDevice(const base::FilePath& device_path, base::File file)
-    : device_path_(device_path),
-      file_(file.Pass()),
+    : DrmDeviceBase(device_path, file.Pass()),
       page_flip_manager_(new PageFlipManager()) {
 }
 
@@ -321,6 +316,10 @@ void DrmDevice::InitializeTaskRunner(
       new IOWatcher(file_.GetPlatformFile(), task_runner_, page_flip_manager_);
 }
 
+DrmDeviceBase::Type DrmDevice::GetType() const {
+  return DRM;
+}
+
 ScopedDrmCrtcPtr DrmDevice::GetCrtc(uint32_t crtc_id) {
   DCHECK(file_.IsValid());
   return ScopedDrmCrtcPtr(drmModeGetCrtc(file_.GetPlatformFile(), crtc_id));