Implement a new child test helper for Android.

mojo/edk/system/message_pipe_unittest.cc

 // Copyright 2013 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 <stdint.h>
 
 #include "base/memory/ref_counted.h"
 #include "mojo/edk/system/test_utils.h"
 #include "mojo/edk/test/mojo_test_base.h"
 #include "mojo/public/c/system/core.h"
@@ skipping 449 matching lines @@
     for (size_t i = 0; i < kPingPongIterations; i++) {
       WriteMessageWithHandles(h, "", p, kPingPongHandlesPerIteration);
       ReadMessageWithHandles(h, p, kPingPongHandlesPerIteration);
     }
     WriteMessage(h, "quit", 4);
   END_CHILD()
   for (size_t i = 0; i < kPingPongHandlesPerIteration; ++i)
     MojoClose(p[i]);
 }
 
-#if defined(OS_ANDROID)
-// Android multi-process tests are not executing the new process. This is flaky.
-#define MAYBE_SharedBufferHandlePingPong DISABLED_SharedBufferHandlePingPong
-#else
-#define MAYBE_SharedBufferHandlePingPong SharedBufferHandlePingPong
-#endif
-TEST_F(MessagePipeTest, MAYBE_SharedBufferHandlePingPong) {
+TEST_F(MessagePipeTest, SharedBufferHandlePingPong) {
   MojoHandle buffers[kPingPongHandlesPerIteration];
   for (size_t i = 0; i <kPingPongHandlesPerIteration; ++i)
     EXPECT_EQ(MOJO_RESULT_OK, MojoCreateSharedBuffer(nullptr, 1, &buffers[i]));
 
   RUN_CHILD_ON_PIPE(HandlePingPong, h)
     for (size_t i = 0; i < kPingPongIterations; i++) {
       WriteMessageWithHandles(h, "", buffers, kPingPongHandlesPerIteration);
       ReadMessageWithHandles(h, buffers, kPingPongHandlesPerIteration);
     }
     WriteMessage(h, "quit", 4);
@@ skipping 154 matching lines @@
   EXPECT_EQ(kTestMessage, ReadMessage(d));
   EXPECT_EQ(MOJO_RESULT_OK, MojoWait(d, MOJO_HANDLE_SIGNAL_PEER_CLOSED,
                                      MOJO_DEADLINE_INDEFINITE, nullptr));
 
   EXPECT_EQ(MOJO_RESULT_OK, MojoClose(d));
 }
 
 }  // namespace
 }  // namespace edk
 }  // namespace mojo