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

mojo/edk/test/run_all_unittests.cc

Index: mojo/edk/test/run_all_unittests.cc
diff --git a/third_party/mojo/src/mojo/edk/test/run_all_unittests.cc b/mojo/edk/test/run_all_unittests.cc
similarity index 86%
copy from third_party/mojo/src/mojo/edk/test/run_all_unittests.cc
copy to mojo/edk/test/run_all_unittests.cc
index 2059347ea3a50b262125f6e2f3e086a41ed983b7..328c24892b1fc63bf4d076a96f7808eb93f2ceb0 100644
--- a/third_party/mojo/src/mojo/edk/test/run_all_unittests.cc
+++ b/mojo/edk/test/run_all_unittests.cc
@@ -6,8 +6,10 @@
 
 #include "base/bind.h"
 #include "base/test/launcher/unit_test_launcher.h"
+#include "base/test/test_io_thread.h"
 #include "base/test/test_suite.h"
 #include "mojo/edk/embedder/test_embedder.h"
+#include "mojo/edk/test/scoped_ipc_support.h"
 #include "mojo/edk/test/test_support_impl.h"
 #include "mojo/public/tests/test_support_private.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ -32,6 +34,8 @@ int main(int argc, char** argv) {
 
   mojo::embedder::test::InitWithSimplePlatformSupport();
   mojo::test::TestSupport::Init(new mojo::test::TestSupportImpl());
+  base::TestIOThread test_io_thread(base::TestIOThread::kAutoStart);
+  mojo::test::ScopedIPCSupport ipc_support(test_io_thread.task_runner());
 
   return base::LaunchUnitTests(
       argc, argv,