win: fix uncaught multiprocess child test failures

test/win/win_multiprocess.cc

 // Copyright 2015 The Crashpad Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
@@ skipping 82 matching lines @@
     pipe_c2p_write_.reset(reinterpret_cast<HANDLE>(c2p_write));
     pipe_p2c_read_.reset(reinterpret_cast<HANDLE>(p2c_read));
 
     // Notify the parent that it's OK to proceed. We only need to wait to get to
     // the process entry point, but this is the easiest place we can notify.
     char c = ' ';
     CheckedWriteFile(WritePipeHandle(), &c, sizeof(c));
 
     // Invoke the child side of the test.
     WinMultiprocessChild();
-    exit(0);
+
+    if (testing::Test::HasFailure())
+      exit(255);
+    exit(EXIT_SUCCESS);
   } else {
     // If we're in the parent, make pipes for child-to-parent and
     // parent-to-child communication. Mark them as inheritable via the
     // SECURITY_ATTRIBUTES, but use SetHandleInformation to ensure that the
     // parent sides are not inherited.
     SECURITY_ATTRIBUTES security_attributes = {0};
     security_attributes.nLength = sizeof(SECURITY_ATTRIBUTES);
     security_attributes.bInheritHandle = true;
 
     HANDLE c2p_read, c2p_write;
@@ skipping 104 matching lines @@
     pipe_c2p_write_.reset();
 }
 
 HANDLE WinMultiprocess::ChildProcess() const {
   EXPECT_NE(nullptr, child_handle_.get());
   return child_handle_.get();
 }
 
 }  // namespace test
 }  // namespace crashpad