Save an early test summary in case the test launcher crashes or gets killed

base/test/launcher/test_results_tracker.cc

Index: base/test/launcher/test_results_tracker.cc
diff --git a/base/test/launcher/test_results_tracker.cc b/base/test/launcher/test_results_tracker.cc
index aadf35069850a57569e2e8c59c9d23a8a95b1311..a8611aee38f70bccb07c50484a3cab5f9e02ca69 100644
--- a/base/test/launcher/test_results_tracker.cc
+++ b/base/test/launcher/test_results_tracker.cc
@@ -296,13 +296,18 @@ void TestResultsTracker::AddGlobalTag(const std::string& tag) {
   global_tags_.insert(tag);
 }
 
-bool TestResultsTracker::SaveSummaryAsJSON(const FilePath& path) const {
+bool TestResultsTracker::SaveSummaryAsJSON(
+    const FilePath& path,
+    const std::vector<std::string>& additional_tags) const {
   std::unique_ptr<DictionaryValue> summary_root(new DictionaryValue);
 
   std::unique_ptr<ListValue> global_tags(new ListValue);
   for (const auto& global_tag : global_tags_) {
     global_tags->AppendString(global_tag);
   }
+  for (const auto& tag : additional_tags) {
+    global_tags->AppendString(tag);
+  }
   summary_root->Set("global_tags", std::move(global_tags));
 
   std::unique_ptr<ListValue> all_tests(new ListValue);