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

mojo/converters/surfaces/tests/BUILD.gn

Index: mojo/converters/surfaces/tests/BUILD.gn
diff --git a/mojo/converters/surfaces/tests/BUILD.gn b/mojo/converters/surfaces/tests/BUILD.gn
index 89e9d2650b99b043c9412feaf87d92ebb48c554f..f2303b3e939c435b81d9adebce015e6895e1a80a 100644
--- a/mojo/converters/surfaces/tests/BUILD.gn
+++ b/mojo/converters/surfaces/tests/BUILD.gn
@@ -19,13 +19,18 @@ test("mojo_surfaces_lib_unittests") {
     "//mojo/environment:chromium",
     "//skia",
     "//testing/gtest",
-    "//third_party/mojo/src/mojo/edk/test:run_all_unittests",
     "//ui/gfx",
     "//ui/gfx/geometry",
     "//ui/gfx:test_support",
     "//ui/mojo/geometry:interfaces",
   ]
 
+  if (use_chrome_edk) {
+    deps += [ "//mojo/edk/test:run_all_unittests" ]
+  } else {
+    deps += [ "//third_party/mojo/src/mojo/edk/test:run_all_unittests" ]
+  }
+
   sources = [
     "surface_unittest.cc",
   ]