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

media/mojo/services/BUILD.gn

Index: media/mojo/services/BUILD.gn
diff --git a/media/mojo/services/BUILD.gn b/media/mojo/services/BUILD.gn
index 0df256abb61e18ab6a13b2c10d022c150830c793..b897e2453fc06ad50e859b0f4ee5d211b723cebb 100644
--- a/media/mojo/services/BUILD.gn
+++ b/media/mojo/services/BUILD.gn
@@ -172,9 +172,19 @@ test("media_mojo_unittests") {
     "//media/mojo/interfaces",
     "//mojo/environment:chromium",
     "//testing/gtest",
-    "//third_party/mojo/src/mojo/edk/system",
-    "//third_party/mojo/src/mojo/edk/test:run_all_unittests",
   ]
+
+  if (use_chrome_edk) {
+    deps += [
+      "//mojo/edk/system",
+      "//mojo/edk/test:run_all_unittests",
+    ]
+  } else {
+    deps += [
+      "//third_party/mojo/src/mojo/edk/system",
+      "//third_party/mojo/src/mojo/edk/test:run_all_unittests",
+    ]
+  }
 }
 
 if (!is_component_build) {