[profiler] Add extra CHECK to track down crbug.com/665398

src/profiler/profile-generator.cc

Index: src/profiler/profile-generator.cc
diff --git a/src/profiler/profile-generator.cc b/src/profiler/profile-generator.cc
index 72e02b360b2cc1f1bb7f1300ad82bfc824f1093c..b3af769f4b10cc5a59ff9044300e54943bf961d9 100644
--- a/src/profiler/profile-generator.cc
+++ b/src/profiler/profile-generator.cc
@@ -424,6 +424,11 @@ namespace {
 void BuildNodeValue(const ProfileNode* node, TracedValue* value) {
   const CodeEntry* entry = node->entry();
   value->BeginDictionary("callFrame");
+// TODO(alph): Extra check to help catch crbug.com/665398
+// Remove before 5.8 branch
+#if V8_MAJOR_VERSION == 5 && V8_MINOR_VERSION == 7
+  CHECK(entry->name());
+#endif
   value->SetString("functionName", entry->name());
   if (*entry->resource_name()) {
     value->SetString("url", entry->resource_name());