Ensure that every Document has a single, distinct template content ownerDocument

LayoutTests/TestExpectations

Index: LayoutTests/TestExpectations
diff --git a/LayoutTests/TestExpectations b/LayoutTests/TestExpectations
index 99bd4794fa4f05048ad67d6a2431863d5ad4e502..fc4e955c5735ae845b9ab44d1a1ee050f8bb8810 100644
--- a/LayoutTests/TestExpectations
+++ b/LayoutTests/TestExpectations
@@ -831,6 +831,11 @@ crbug.com/323858 [ XP ] fast/workers/storage/interrupt-database.html [ Pass Time
 crbug.com/315321 compositing/squashing/squash-transform.html [ Crash ]
 crbug.com/315321 virtual/softwarecompositing/squashing/squash-transform.html [ Crash ]
 
+# Template tests that need a merge from upstream to match spec (and subsequent Blink) changes
+crbug.com/325442 w3c/web-platform-tests/html-templates/definitions/template-contents-owner-test-001.html [ Failure ]
+crbug.com/325442 w3c/web-platform-tests/html-templates/template-element/node-document-changes.html [ Failure ]
+crbug.com/325442 w3c/web-platform-tests/html-templates/template-element/template-content-node-document.html [ Failure ]
+
 # FIXME(crbug.com/302005): Remove these as expectations are updated or the fasttextautosizer improves.
 crbug.com/322782 virtual/fasttextautosizing/fast/text-autosizing/cluster-inline-grid-flex-box.html [ ImageOnlyFailure ]
 crbug.com/322782 virtual/fasttextautosizing/fast/text-autosizing/cluster-list-item.html [ ImageOnlyFailure ]