Update from https://crrev.com/304418

base/test/multiprocess_test_android.cc

Index: base/test/multiprocess_test_android.cc
diff --git a/base/test/multiprocess_test_android.cc b/base/test/multiprocess_test_android.cc
index 4cfae5ecaacd51449e018018b2b9579de09d50bc..8f54b82b5ea4512bf15c4e3b21116e495a7783cb 100644
--- a/base/test/multiprocess_test_android.cc
+++ b/base/test/multiprocess_test_android.cc
@@ -2,13 +2,15 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "base/posix/global_descriptors.h"
 #include "base/test/multiprocess_test.h"
 
 #include <unistd.h>
 
+#include "base/base_switches.h"
+#include "base/command_line.h"
 #include "base/containers/hash_tables.h"
 #include "base/logging.h"
+#include "base/posix/global_descriptors.h"
 #include "testing/multiprocess_func_list.h"
 
 namespace base {
@@ -16,7 +18,6 @@ namespace base {
 // A very basic implementation for Android. On Android tests can run in an APK
 // and we don't have an executable to exec*. This implementation does the bare
 // minimum to execute the method specified by procname (in the child process).
-//  - |base_command_line| is ignored.
 //  - All options except |fds_to_remap| are ignored.
 ProcessHandle SpawnMultiProcessTestChild(const std::string& procname,
                                          const CommandLine& base_command_line,
@@ -60,6 +61,13 @@ ProcessHandle SpawnMultiProcessTestChild(const std::string& procname,
     }
     close(old_fd);
   }
+  CommandLine::Reset();
+  CommandLine::Init(0, nullptr);
+  CommandLine* command_line = CommandLine::ForCurrentProcess();
+  command_line->InitFromArgv(base_command_line.argv());
+  if (!command_line->HasSwitch(switches::kTestChildProcess))
+    command_line->AppendSwitchASCII(switches::kTestChildProcess, procname);
+
   _exit(multi_process_function_list::InvokeChildProcessTest(procname));
   return 0;
 }