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

components/mus/public/cpp/tests/BUILD.gn

Index: components/mus/public/cpp/tests/BUILD.gn
diff --git a/components/mus/public/cpp/tests/BUILD.gn b/components/mus/public/cpp/tests/BUILD.gn
index c58299498238a49bf0866e844b2f40302a1ed5dd..50c4ccd8bc50a8a5539ebf9dbdcfe355e68047c8 100644
--- a/components/mus/public/cpp/tests/BUILD.gn
+++ b/components/mus/public/cpp/tests/BUILD.gn
@@ -38,10 +38,15 @@ test("mojo_view_manager_lib_unittests") {
     "//mojo/application/public/cpp",
     "//testing/gtest",
     "//third_party/mojo/src/mojo/public/cpp/system",
-    "//third_party/mojo/src/mojo/edk/system",
     "//ui/mojo/geometry:interfaces",
   ]
 
+  if (use_chrome_edk) {
+    deps += [ "//mojo/edk/system" ]
+  } else {
+    deps += [ "//third_party/mojo/src/mojo/edk/system" ]
+  }
+
   if (use_x11) {
     deps += [ "//ui/gfx/x" ]
   }