The detailed heap snapshot generator was slightly adjusted for tracking sliced strings.

test/cctest/test-heap-profiler.cc

Index: test/cctest/test-heap-profiler.cc
diff --git a/test/cctest/test-heap-profiler.cc b/test/cctest/test-heap-profiler.cc
index d695d7438fc3e1a00f2b0565c6622d6dd2e288b6..87e7a7d0f95ed53f5c85350fa71b29c2cdb0ddcd 100644
--- a/test/cctest/test-heap-profiler.cc
+++ b/test/cctest/test-heap-profiler.cc
@@ -252,6 +252,28 @@ TEST(HeapSnapshotHeapNumbers) {
   CHECK_EQ(v8::HeapGraphNode::kHeapNumber, b->GetType());
 }
 
+TEST(HeapSnapshotSlicedString) {
+  v8::HandleScope scope;
+  LocalContext env;
+  CompileRun(
+      "parent_string = \"123456789.123456789.123456789.123456789.123456789."
+      "123456789.123456789.123456789.123456789.123456789."
+      "123456789.123456789.123456789.123456789.123456789."
+      "123456789.123456789.123456789.123456789.123456789.\";"
+      "child_string = parent_string.slice(100);");
+  const v8::HeapSnapshot* snapshot =
+      v8::HeapProfiler::TakeSnapshot(v8_str("strings"));
+  const v8::HeapGraphNode* global = GetGlobalObject(snapshot);
+  const v8::HeapGraphNode* parent_string =
+      GetProperty(global, v8::HeapGraphEdge::kShortcut, "parent_string");
+  CHECK_NE(NULL, parent_string);
+  const v8::HeapGraphNode* child_string =
+      GetProperty(global, v8::HeapGraphEdge::kShortcut, "child_string");
+  CHECK_NE(NULL, child_string);
+  const v8::HeapGraphNode* parent =
+      GetProperty(child_string, v8::HeapGraphEdge::kInternal, "parent");
+  CHECK_EQ(parent_string, parent);
+}
 
 TEST(HeapSnapshotInternalReferences) {
   v8::HandleScope scope;