[turbofan] Add schedule to visualizer output

test/unittests/compiler/instruction-selector-unittest.cc

Index: test/unittests/compiler/instruction-selector-unittest.cc
diff --git a/test/unittests/compiler/instruction-selector-unittest.cc b/test/unittests/compiler/instruction-selector-unittest.cc
index 10c457d696e90e6747396a5db0c575fa236795e9..463480ba0e421cbfdf19509eed4f76fb7d973f60 100644
--- a/test/unittests/compiler/instruction-selector-unittest.cc
+++ b/test/unittests/compiler/instruction-selector-unittest.cc
@@ -6,6 +6,7 @@
 
 #include "src/compiler/graph.h"
 #include "src/compiler/schedule.h"
+#include "src/compiler/visualizer.h"
 #include "src/flags.h"
 #include "test/unittests/compiler/compiler-test-utils.h"
 
@@ -33,7 +34,7 @@ InstructionSelectorTest::Stream InstructionSelectorTest::StreamBuilder::Build(
   if (FLAG_trace_turbo) {
     OFStream out(stdout);
     out << "=== Schedule before instruction selection ===" << std::endl
-        << *schedule;
+        << ScheduleAsJSON(*schedule);
   }
   size_t const node_count = graph()->NodeCount();
   EXPECT_NE(0u, node_count);