Set limit for number of failed EXPECTs per test in test launcher output.

base/test/launcher/unit_test_launcher.cc

Index: base/test/launcher/unit_test_launcher.cc
diff --git a/base/test/launcher/unit_test_launcher.cc b/base/test/launcher/unit_test_launcher.cc
index 44c440fb76f4be9355a783bcfcc7b09def078bcc..65531a2c348102c4f299a16e7a09ff37bc2731e0 100644
--- a/base/test/launcher/unit_test_launcher.cc
+++ b/base/test/launcher/unit_test_launcher.cc
@@ -92,6 +92,11 @@ void PrintUsage() {
           "    Controls when full test output is printed.\n"
           "    auto means to print it when the test failed.\n"
           "\n"
+          "  --test-launcher-test-part-results-limit=N\n"
+          "    Sets the limit of failed EXPECT/ASSERT entries in the xml and\n"
+          "    JSON outputs per test to N (default N=10). Negative value \n"
+          "    will disable this limit.\n"
+          "\n"
           "  --test-launcher-total-shards=N\n"
           "    Sets the total number of shards to N.\n"
           "\n"