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

mojo/edk/test/test_support_impl.h

Index: mojo/edk/test/test_support_impl.h
diff --git a/third_party/mojo/src/mojo/edk/test/test_support_impl.h b/mojo/edk/test/test_support_impl.h
similarity index 91%
copy from third_party/mojo/src/mojo/edk/test/test_support_impl.h
copy to mojo/edk/test/test_support_impl.h
index 589253a0eb83f829d28c033a8a4dbe97b83571a1..e672999b954b2283eb2d972ea5e080fbb2f56fc1 100644
--- a/third_party/mojo/src/mojo/edk/test/test_support_impl.h
+++ b/mojo/edk/test/test_support_impl.h
@@ -11,9 +11,10 @@
 #include "mojo/public/tests/test_support_private.h"
 
 namespace mojo {
+namespace edk {
 namespace test {
 
-class TestSupportImpl : public TestSupport {
+class TestSupportImpl : public mojo::test::TestSupport {
  public:
   TestSupportImpl();
   ~TestSupportImpl() override;
@@ -31,6 +32,7 @@ class TestSupportImpl : public TestSupport {
 };
 
 }  // namespace test
+}  // namespace edk
 }  // namespace mojo
 
 #endif  // MOJO_EDK_TEST_TEST_SUPPORT_IMPL_H_