Make RenderedRectsForMarkers() to ignore disconnected nodes.

third_party/WebKit/Source/core/editing/VisibleUnits.cpp

Index: third_party/WebKit/Source/core/editing/VisibleUnits.cpp
diff --git a/third_party/WebKit/Source/core/editing/VisibleUnits.cpp b/third_party/WebKit/Source/core/editing/VisibleUnits.cpp
index f1da75b0e408206c7b87a6ce891b67ed7c7005fc..24d9a73d88038e4e413c1ecc385d8934bd2ffe2d 100644
--- a/third_party/WebKit/Source/core/editing/VisibleUnits.cpp
+++ b/third_party/WebKit/Source/core/editing/VisibleUnits.cpp
@@ -4040,6 +4040,48 @@ static PositionTemplate<Strategy> skipWhitespaceAlgorithm(
   return runner;
 }
 
+template <typename Strategy>
+void textRects(Vector<IntRect>& rects,
+               const EphemeralRangeTemplate<Strategy>& range) {
+  const PositionTemplate<Strategy> startPosition = range.startPosition();
+  const PositionTemplate<Strategy> endPosition = range.startPosition();
+  Node* startContainer = startPosition.computeContainerNode();
+  DCHECK(startContainer);
+  Node* endContainer = endPosition.computeContainerNode();
+  DCHECK(endContainer);
+
+  for (Node& node : range.nodes()) {
+    LayoutObject* layoutObject = node.layoutObject();
+    if (!layoutObject || !layoutObject->isText())
+      continue;
+    LayoutText* layoutText = toLayoutText(layoutObject);
+    unsigned startOffset =
+        node == startContainer ? startPosition.offsetInContainerNode() : 0;
+    unsigned endOffset = node == endContainer
+                             ? endPosition.offsetInContainerNode()
+                             : std::numeric_limits<unsigned>::max();
+    layoutText->absoluteRectsForRange(rects, startOffset, endOffset);
+  }
+}
+
+IntRect boundingBox(const EphemeralRange& range) {
+  IntRect result;
+  Vector<IntRect> rects;
+  textRects(rects, range);
+  for (const IntRect& rect : rects)
+    result.unite(rect);
+  return result;
+}
+
+IntRect boundingBox(const EphemeralRangeInFlatTree& range) {
+  IntRect result;
+  Vector<IntRect> rects;
+  textRects(rects, range);
+  for (const IntRect& rect : rects)
+    result.unite(rect);
+  return result;
+}
+
 Position skipWhitespace(const Position& position) {
   return skipWhitespaceAlgorithm(position);
 }