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

mojo/edk/system/test_utils.h

 // 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.
 
 #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);
 
 // A timeout smaller than |TestTimeouts::tiny_timeout()|, as a |MojoDeadline|.
 // Warning: This may lead to flakiness, but this is unavoidable if, e.g., you're
 // trying to ensure that functions with timeouts are reasonably accurate. We
 // want this to be as small as possible without causing too much flakiness.
 MojoDeadline EpsilonDeadline();
 
 // |TestTimeouts::tiny_timeout()|, as a |MojoDeadline|. (Expect this to be on
 // the order of 100 ms.)
 MojoDeadline TinyDeadline();
 
-// |TestTimeouts::action_timeout()|, as a |MojoDeadline|. (Expect this to be on
+// |TestTimeouts::action_timeout()|, as a |MojoDeadline|.(Expect this to be on
 // the order of 10 s.)
 MojoDeadline ActionDeadline();
 
 // Sleeps for at least the specified duration.
 void Sleep(MojoDeadline deadline);
 
 // Stopwatch -------------------------------------------------------------------
 
 // A simple "stopwatch" for measuring time elapsed from a given starting point.
 class Stopwatch {
  public:
   Stopwatch();
   ~Stopwatch();
 
   void Start();
   // Returns the amount of time elapsed since the last call to |Start()| (in
   // microseconds).
   MojoDeadline Elapsed();
 
  private:
   base::TimeTicks start_time_;
 
   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;
+
+ 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  // MOJO_EDK_SYSTEM_TEST_UTILS_H_