Mojo EDK: Work around Nexus 9 hardware bug

mojo/edk/system/message_pipe_unittest.cc

Index: mojo/edk/system/message_pipe_unittest.cc
diff --git a/mojo/edk/system/message_pipe_unittest.cc b/mojo/edk/system/message_pipe_unittest.cc
index fcfaeca17904300dca21f92fae0d9f510da7ec58..3aa1e1185d7d26d1ed5e652938a8a7fd4cf1b327 100644
--- a/mojo/edk/system/message_pipe_unittest.cc
+++ b/mojo/edk/system/message_pipe_unittest.cc
@@ -706,6 +706,18 @@ TEST_F(FuseMessagePipeTest, FuseAfterPeerWriteAndClosure) {
   EXPECT_EQ(MOJO_RESULT_OK, MojoClose(d));
 }
 
+TEST_F(MessagePipeTest, ClosePipesStressTest) {
+  // Tests Nexus 9 hardware bug triggered by a code sequence in port closure
+  // notification logic. https://crbug.com/665869.
+  const size_t kNumPipes = 100000;
+  for (size_t i = 0; i < kNumPipes; ++i) {
+    MojoHandle a, b;
+    CreateMessagePipe(&a, &b);
+    MojoClose(a);
+    MojoClose(b);
+  }
+}
+
 }  // namespace
 }  // namespace edk
 }  // namespace mojo