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

extensions/renderer/BUILD.gn

Index: extensions/renderer/BUILD.gn
diff --git a/extensions/renderer/BUILD.gn b/extensions/renderer/BUILD.gn
index ee300caeff7932cf28c6df496a28728e759f6126..aad938d73927f29ef61a4abb75a4c0d56405ae31 100644
--- a/extensions/renderer/BUILD.gn
+++ b/extensions/renderer/BUILD.gn
@@ -28,7 +28,12 @@ source_set("renderer") {
     "//gin",
     "//skia",
     "//third_party/WebKit/public:blink",
-    "//third_party/mojo/src/mojo/edk/js",
     "//third_party/mojo/src/mojo/public/js",
   ]
+
+  if (use_chrome_edk) {
+    deps += [ "//mojo/edk/js" ]
+  } else {
+    deps += [ "//third_party/mojo/src/mojo/edk/js" ]
+  }
 }