GTTF: Update --help for new test launcher.

content/public/test/test_launcher.cc

Index: content/public/test/test_launcher.cc
diff --git a/content/public/test/test_launcher.cc b/content/public/test/test_launcher.cc
index 87a56b618bc80a8991ceab5d44656458d6993eb5..f3fcb5ec0c906607ee1cfa1acb99619174d66c4e 100644
--- a/content/public/test/test_launcher.cc
+++ b/content/public/test/test_launcher.cc
@@ -69,17 +69,42 @@ std::string RemoveAnyPrePrefixes(const std::string& test_name) {
 
 void PrintUsage() {
   fprintf(stdout,
-      "Runs tests using the gtest framework, each test being run in its own\n"
-      "process.  Any gtest flags can be specified.\n"
-      "  --single_process\n"
-      "    Runs the tests and the launcher in the same process. Useful for \n"
-      "    debugging a specific test in a debugger.\n"
-      "  --single-process\n"
-      "    Same as above, and also runs Chrome in single-process mode.\n"
-      "  --help\n"
-      "    Shows this message.\n"
-      "  --gtest_help\n"
-      "    Shows the gtest help message.\n");
+          "Runs tests using the gtest framework, each batch of tests being\n"
+          "run in their own process. Supported command-line flags:\n"
+          "\n"
+          " Common flags:\n"
+          "  --gtest_filter=...\n"
+          "    Runs a subset of tests (see --gtest_help for more info).\n"
+          "\n"
+          "  --help\n"
+          "    Shows this message.\n"
+          "\n"
+          "  --gtest_help\n"
+          "    Shows the gtest help message.\n"
+          "\n"
+          "  --test-launcher-jobs=N\n"
+          "    Sets the number of parallel test jobs to N.\n"
+          "\n"
+          "  --single_process\n"
+          "    Runs the tests and the launcher in the same process. Useful\n"
+          "    for debugging a specific test in a debugger.\n"
+          "\n"
+          " Other flags:\n"
+          "  --test-launcher-retry-limit=N\n"
+          "    Sets the limit of test retries on failures to N.\n"
+          "\n"
+          "  --test-launcher-summary-output=PATH\n"
+          "    Saves a JSON machine-readable summary of the run.\n"
+          "\n"
+          "  --test-launcher-print-test-stdio=auto|always|never\n"
+          "    Controls when full test output is printed.\n"
+          "    auto means to print it when the test failed.\n"
+          "\n"
+          "  --test-launcher-total-shards=N\n"
+          "    Sets the total number of shards to N.\n"
+          "\n"
+          "  --test-launcher-shard-index=N\n"
+          "    Sets the shard index to run to N (from 0 to TOTAL - 1).\n");
 }
 
 // Implementation of base::TestLauncherDelegate. This is also a test launcher,