[CodeHealth] Add a reason for RAW_PTR_EXCLUSION in openxr_view_configuration.h

Bug: 346693320
Change-Id: I801bde8891ad579204d93497740f92283700e0d4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6302337
Reviewed-by: Brandon Jones <bajones@chromium.org>
Commit-Queue: Oksana Zhuravlova <oksamyt@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1424766}

device/vr/openxr/openxr_view_configuration.h

@@ -168,8 +168,8 @@ class OpenXrLayers {
   // support a single projection layer. XrCompositionLayerBaseHeader* is needed
   // because xrEndFrame expects an array containing pointers of all the layers.
   XrCompositionLayerProjection primary_projection_layer_;
-  // This field is not a raw_ptr<> because it was filtered by the rewriter for:
-  // #addr-of
+
+  // RAW_PTR_EXCLUSION: #addr-of (address returned from a function)
   RAW_PTR_EXCLUSION XrCompositionLayerBaseHeader* primary_composition_layer_ =
       reinterpret_cast<XrCompositionLayerBaseHeader*>(
           &primary_projection_layer_);