Increase the broken tests threshold from 10 to 20

base/test/launcher/test_launcher.cc

Index: base/test/launcher/test_launcher.cc
diff --git a/base/test/launcher/test_launcher.cc b/base/test/launcher/test_launcher.cc
index 889244d92662021b20f79694528edd70170ef7b0..a37c4afa4b844333d2f9954e7615b689afcd7724 100644
--- a/base/test/launcher/test_launcher.cc
+++ b/base/test/launcher/test_launcher.cc
@@ -488,7 +488,7 @@ void TestLauncher::OnTestFinished(const TestResult& result) {
     test_broken_count_++;
   }
   size_t broken_threshold =
-      std::max(static_cast<size_t>(10), test_started_count_ / 10);
+      std::max(static_cast<size_t>(20), test_started_count_ / 10);
   if (test_broken_count_ >= broken_threshold) {
     fprintf(stdout, "Too many badly broken tests (%" PRIuS "), exiting now.\n",
             test_broken_count_);