Update from https://crrev.com/312398

base/test/test_switches.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/test/test_switches.h"
 
 // Maximum number of tests to run in a single batch.
 const char switches::kTestLauncherBatchLimit[] = "test-launcher-batch-limit";
 
 // Sets defaults desirable for the continuous integration bots, e.g. parallel
@@ skipping 24 matching lines @@
 
 // Path to test results file with all the info from the test launcher.
 const char switches::kTestLauncherSummaryOutput[] =
     "test-launcher-summary-output";
 
 // Flag controlling when test stdio is displayed as part of the launcher's
 // standard output.
 const char switches::kTestLauncherPrintTestStdio[] =
     "test-launcher-print-test-stdio";
 
+// Print a writable path and exit (for internal use).
+const char switches::kTestLauncherPrintWritablePath[] =
+    "test-launcher-print-writable-path";
+
 // Index of the test shard to run, starting from 0 (first shard) to total shards
 // minus one (last shard).
 const char switches::kTestLauncherShardIndex[] =
     "test-launcher-shard-index";
 
 // Total number of shards. Must be the same for all shards.
 const char switches::kTestLauncherTotalShards[] =
     "test-launcher-total-shards";
 
 // Time (in milliseconds) that the tests should wait before timing out.
 const char switches::kTestLauncherTimeout[] = "test-launcher-timeout";
 // TODO(phajdan.jr): Clean up the switch names.
 const char switches::kTestTinyTimeout[] = "test-tiny-timeout";
 const char switches::kUiTestActionTimeout[] = "ui-test-action-timeout";
 const char switches::kUiTestActionMaxTimeout[] = "ui-test-action-max-timeout";