Changing multiprocess test SpawnChild to return a struct.

base/debug/stack_trace_unittest.cc

 // Copyright (c) 2011 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 <stddef.h>
 
 #include <limits>
 #include <sstream>
 #include <string>
 
@@ skipping 153 matching lines @@
   char* pointer = newArray();
   delete pointer;
   return 2;
 }
 
 // Regression test for StackDumpingSignalHandler async-signal unsafety.
 // Combined with tcmalloc's debugallocation, that signal handler
 // and e.g. mismatched new[]/delete would cause a hang because
 // of re-entering malloc.
 TEST_F(StackTraceTest, AsyncSignalUnsafeSignalHandlerHang) {
-  Process child = SpawnChild("MismatchedMallocChildProcess");
-  ASSERT_TRUE(child.IsValid());
+  SpawnChildResult spawn_result = SpawnChild("MismatchedMallocChildProcess");
+  ASSERT_TRUE(spawn_result.process.IsValid());
   int exit_code;
-  ASSERT_TRUE(child.WaitForExitWithTimeout(TestTimeouts::action_timeout(),
-                                           &exit_code));
+  ASSERT_TRUE(spawn_result.process.WaitForExitWithTimeout(
+      TestTimeouts::action_timeout(), &exit_code));
 }
 #endif  // !defined(OS_IOS)
 
 namespace {
 
 std::string itoa_r_wrapper(intptr_t i, size_t sz, int base, size_t padding) {
   char buffer[1024];
   CHECK_LE(sz, sizeof(buffer));
 
   char* result = internal::itoa_r(i, buffer, sz, base, padding);
@@ skipping 121 matching lines @@
 #endif
 
 TEST_F(StackTraceTest, MAYBE_StackEnd) {
   EXPECT_NE(0u, GetStackEnd());
 }
 
 #endif  // HAVE_TRACE_STACK_FRAME_POINTERS
 
 }  // namespace debug
 }  // namespace base