Add a Mojo EDK for Chrome that uses one OS pipe per message pipe.

mojo/edk/system/test_utils.h

Index: mojo/edk/system/test_utils.h
diff --git a/third_party/mojo/src/mojo/edk/system/test_utils.h b/mojo/edk/system/test_utils.h
similarity index 67%
copy from third_party/mojo/src/mojo/edk/system/test_utils.h
copy to mojo/edk/system/test_utils.h
index c821dc1d224052119e83fda543045908e803a414..cf244b3a6df843c9d38d2ed986f0dd3a2047209d 100644
--- a/third_party/mojo/src/mojo/edk/system/test_utils.h
+++ b/mojo/edk/system/test_utils.h
@@ -2,15 +2,18 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef THIRD_PARTY_MOJO_SRC_MOJO_EDK_SYSTEM_TEST_UTILS_H_
-#define THIRD_PARTY_MOJO_SRC_MOJO_EDK_SYSTEM_TEST_UTILS_H_
+#ifndef MOJO_EDK_SYSTEM_TEST_UTILS_H_
+#define MOJO_EDK_SYSTEM_TEST_UTILS_H_
 
+#include "base/test/test_io_thread.h"
 #include "base/time/time.h"
+#include "mojo/edk/test/scoped_ipc_support.h"
 #include "mojo/public/c/system/types.h"
 #include "mojo/public/cpp/system/macros.h"
+#include "testing/gtest/include/gtest/gtest.h"
 
 namespace mojo {
-namespace system {
+namespace edk {
 namespace test {
 
 MojoDeadline DeadlineFromMilliseconds(unsigned milliseconds);
@@ -51,8 +54,25 @@ class Stopwatch {
   MOJO_DISALLOW_COPY_AND_ASSIGN(Stopwatch);
 };
 
+// A base class which initializes and shuts down the necessary objects so that
+// Mojo system calls can be made.
+class MojoSystemTest : public testing::Test {
+ public:
+  MojoSystemTest();
+  ~MojoSystemTest() override;
+
+  base::TestIOThread* test_io_thread() { return &test_io_thread_; }
+
+ private:
+  base::MessageLoop message_loop_;
+  base::TestIOThread test_io_thread_;
+  test::ScopedIPCSupport ipc_support_;
+
+  MOJO_DISALLOW_COPY_AND_ASSIGN(MojoSystemTest);
+};
+
 }  // namespace test
-}  // namespace system
+}  // namespace edk
 }  // namespace mojo
 
-#endif  // THIRD_PARTY_MOJO_SRC_MOJO_EDK_SYSTEM_TEST_UTILS_H_
+#endif  // MOJO_EDK_SYSTEM_TEST_UTILS_H_