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

mojo/edk/test/test_support_impl.cc

Index: mojo/edk/test/test_support_impl.cc
diff --git a/third_party/mojo/src/mojo/edk/test/test_support_impl.cc b/mojo/edk/test/test_support_impl.cc
similarity index 98%
copy from third_party/mojo/src/mojo/edk/test/test_support_impl.cc
copy to mojo/edk/test/test_support_impl.cc
index 2f1c63e5960f7db5bfc81bc95e7871c8c07880dc..c91fcf37272f6212b9ae9f6ff0d8842b76206bd0 100644
--- a/third_party/mojo/src/mojo/edk/test/test_support_impl.cc
+++ b/mojo/edk/test/test_support_impl.cc
@@ -20,6 +20,7 @@
 #include "base/test/perf_log.h"
 
 namespace mojo {
+namespace edk {
 namespace test {
 namespace {
 
@@ -78,4 +79,5 @@ char** TestSupportImpl::EnumerateSourceRootRelativeDirectory(
 }
 
 }  // namespace test
+}  // namespace edk
 }  // namespace mojo