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

base/test/test_switches.cc

Index: base/test/test_switches.cc
diff --git a/base/test/test_switches.cc b/base/test/test_switches.cc
index 817a38edb18f56bf5c1f9354977b7497fdd8ce44..48f6861330ad2569e2d3db7a0ea41c9d78118633 100644
--- a/base/test/test_switches.cc
+++ b/base/test/test_switches.cc
@@ -56,6 +56,11 @@ const char switches::kTestLauncherPrintWritablePath[] =
 const char switches::kTestLauncherShardIndex[] =
     "test-launcher-shard-index";
 
+// Limit of test part results in the output. Default limit is 10.
+// Negative value will completely disable limit.
+const char switches::kTestLauncherTestPartResultsLimit[] =
+    "test-launcher-test-part-results-limit";
+
 // Total number of shards. Must be the same for all shards.
 const char switches::kTestLauncherTotalShards[] =
     "test-launcher-total-shards";