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

components/mus/BUILD.gn

Index: components/mus/BUILD.gn
diff --git a/components/mus/BUILD.gn b/components/mus/BUILD.gn
index 956f8ff085c7b970ca56fe7053621589bbd9d496..5e65e76024052507dfa9fd9e02c5f49587eb9781 100644
--- a/components/mus/BUILD.gn
+++ b/components/mus/BUILD.gn
@@ -172,7 +172,6 @@ test("view_manager_unittests") {
     "//mojo/converters/transform",
     "//mojo/environment:chromium",
     "//mojo/platform_handle",
-    "//third_party/mojo/src/mojo/edk/test:run_all_unittests",
     "//third_party/mojo/src/mojo/public/cpp/bindings:bindings",
     "//ui/mojo/geometry:interfaces",
     "//ui/mojo/events:interfaces",
@@ -182,6 +181,12 @@ test("view_manager_unittests") {
     "//ui/gfx/geometry",
   ]
 
+  if (use_chrome_edk) {
+    deps += [ "//mojo/edk/test:run_all_unittests" ]
+  } else {
+    deps += [ "//third_party/mojo/src/mojo/edk/test:run_all_unittests" ]
+  }
+
   if (!is_android) {  # TODO(GYP) Enable on Android when osmesa links.
     deps += [ "//third_party/mesa:osmesa" ]
   }