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

ui/ozone/platform/dri/dri_wrapper.h

Index: ui/ozone/platform/dri/dri_wrapper.h
diff --git a/ui/ozone/platform/dri/dri_wrapper.h b/ui/ozone/platform/dri/dri_wrapper.h
index b2123ab0537edcf417138c4e2c65e408724cade7..a555814e287157470031224944a229e69ff768ef 100644
--- a/ui/ozone/platform/dri/dri_wrapper.h
+++ b/ui/ozone/platform/dri/dri_wrapper.h
@@ -30,6 +30,9 @@ class DriWrapper {
   DriWrapper(const char* device_path);
   virtual ~DriWrapper();
 
+  // Open device.
+  virtual void Initialize();
+
   // Get the CRTC state. This is generally used to save state before using the
   // CRTC. When the user finishes using the CRTC, the user should restore the
   // CRTC to it's initial state. Use |SetCrtc| to restore the state.
@@ -135,6 +138,9 @@ class DriWrapper {
   int fd_;
 
  private:
+  // Path to DRM device.
+  const char* device_path_;
+
   DISALLOW_COPY_AND_ASSIGN(DriWrapper);
 };