Support multi-chunk differences

src/runtime.cc

Index: src/runtime.cc
diff --git a/src/runtime.cc b/src/runtime.cc
index ab7701835032820360f01d86ece1e2bcf366b101..dd0a3d2a0dbb65390c05c76282407dbff04830ad 100644
--- a/src/runtime.cc
+++ b/src/runtime.cc
@@ -9766,7 +9766,7 @@ static Object* Runtime_LiveEditCheckAndDropActivations(Arguments args) {
 }
 
 // Compares 2 strings line-by-line and returns diff in form of JSArray of
-// triplets (pos1, len1, len2) describing list of diff chunks.
+// triplets (pos1, pos1_end, pos2_end) describing list of diff chunks.
 static Object* Runtime_LiveEditCompareStringsLinewise(Arguments args) {
   ASSERT(args.length() == 2);
   HandleScope scope;