Add multiprocess test helper functions.

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 c518bb438ac87e652ec38b20aac66288b7b5dcdc..8a85cdf71e76e6993c154da8b074c4e38565184c 100644
--- a/base/test/multiprocess_test_android.cc
+++ b/base/test/multiprocess_test_android.cc
@@ -15,14 +15,15 @@ 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.
 //  - |debug_on_start| is ignored.
-ProcessHandle MultiProcessTest::SpawnChildWithOptions(
-    const std::string& procname,
-    const LaunchOptions& options,
-    bool debug_on_start) {
-  // TODO(vtl): The FD-remapping done below is wrong in the presence of cycles
-  // (e.g., fd1 -> fd2, fd2 -> fd1). crbug.com/326576
+ProcessHandle SpawnMultiProcessTestChild(const std::string& procname,
+                                         const CommandLine& base_command_line,
+                                         const LaunchOptions& options,
+                                         bool debug_on_start) {
+  // TODO(viettrungluu): The FD-remapping done below is wrong in the presence of
+  // cycles (e.g., fd1 -> fd2, fd2 -> fd1). crbug.com/326576
   FileHandleMappingVector empty;
   const FileHandleMappingVector* fds_to_remap =
       options.fds_to_remap ? options.fds_to_remap : ∅