[MarkersIntersectingRange #2] Add DocumentMarkerController::MarkersIntersectingRange()

third_party/WebKit/Source/core/editing/markers/DocumentMarkerController.h

Index: third_party/WebKit/Source/core/editing/markers/DocumentMarkerController.h
diff --git a/third_party/WebKit/Source/core/editing/markers/DocumentMarkerController.h b/third_party/WebKit/Source/core/editing/markers/DocumentMarkerController.h
index 64d9ebdb2ac32b413c008162d48ba1d76fef6fc3..10614d83d2164a3f357e0c2ec530d3eb82124dc6 100644
--- a/third_party/WebKit/Source/core/editing/markers/DocumentMarkerController.h
+++ b/third_party/WebKit/Source/core/editing/markers/DocumentMarkerController.h
@@ -94,6 +94,13 @@ class CORE_EXPORT DocumentMarkerController final
   // Position in its interior (not at an endpoint), if one exists.
   DocumentMarker* MarkerAtPosition(const Position&,
                                    DocumentMarker::MarkerTypes);
+  // Return all markers of the specified types whose interiors have non-empty
+  // overlap with the range [start_offset, end_offset]. Note that the range can
+  // be collapsed, in which case markers containing the offset in their
+  // interiors are returned.
+  HeapVector<std::pair<Member<Node>, Member<DocumentMarker>>>
+  MarkersIntersectingRange(const EphemeralRangeInFlatTree&,
+                           DocumentMarker::MarkerTypes);
   DocumentMarkerVector MarkersFor(
       Node*,
       DocumentMarker::MarkerTypes = DocumentMarker::AllMarkers());