[Ozone-GBM] Add basic support for display configuration over IPC

ui/ozone/platform/dri/chromeos/native_display_delegate_dri.cc

Index: ui/ozone/platform/dri/chromeos/native_display_delegate_dri.cc
diff --git a/ui/ozone/platform/dri/chromeos/native_display_delegate_dri.cc b/ui/ozone/platform/dri/chromeos/native_display_delegate_dri.cc
index f765cd3c9dad7a81073e411e947d9c8fdc93d9e9..fff9defdba1f346a76d7b4aaa09546572fc05157 100644
--- a/ui/ozone/platform/dri/chromeos/native_display_delegate_dri.cc
+++ b/ui/ozone/platform/dri/chromeos/native_display_delegate_dri.cc
@@ -32,11 +32,21 @@ NativeDisplayDelegateDri::NativeDisplayDelegateDri(
 }
 
 NativeDisplayDelegateDri::~NativeDisplayDelegateDri() {
-  device_manager_->RemoveObserver(this);
+  if (device_manager_)
+    device_manager_->RemoveObserver(this);
+}
+
+DisplaySnapshot* NativeDisplayDelegateDri::FindDisplaySnapshot(int64_t id) {
+  for (size_t i = 0; i < cached_displays_.size(); ++i)
+    if (cached_displays_[i]->display_id() == id)
+      return cached_displays_[i];
+
+  return NULL;
 }
 
 void NativeDisplayDelegateDri::Initialize() {
-  device_manager_->AddObserver(this);
+  if (device_manager_)
+    device_manager_->AddObserver(this);
 
   ScopedVector<HardwareDisplayControllerInfo> displays =
       GetAvailableDisplayControllerInfos(dri_->get_fd());