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

mojo/application/public/cpp/tests/BUILD.gn

Index: mojo/application/public/cpp/tests/BUILD.gn
diff --git a/mojo/application/public/cpp/tests/BUILD.gn b/mojo/application/public/cpp/tests/BUILD.gn
index 29b35d8b84c9ea8b74b8e9493bd8c5b3575c8cdf..8cac10928ef40bd6bd9a2b00748977631299b4c7 100644
--- a/mojo/application/public/cpp/tests/BUILD.gn
+++ b/mojo/application/public/cpp/tests/BUILD.gn
@@ -13,6 +13,11 @@ test("mojo_public_application_unittests") {
     "//base",
     "//mojo/application/public/cpp",
     "//testing/gtest",
-    "//third_party/mojo/src/mojo/edk/test:run_all_unittests",
   ]
+
+  if (use_chrome_edk) {
+    deps += [ "//mojo/edk/test:run_all_unittests" ]
+  } else {
+    deps += [ "//third_party/mojo/src/mojo/edk/test:run_all_unittests" ]
+  }
 }