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

mojo/runner/BUILD.gn

Index: mojo/runner/BUILD.gn
diff --git a/mojo/runner/BUILD.gn b/mojo/runner/BUILD.gn
index 558b3274f142f7ca1ee74863c596105e28fecc24..02a2e5b00ae60494c2894aff27e22aa1f9225838 100644
--- a/mojo/runner/BUILD.gn
+++ b/mojo/runner/BUILD.gn
@@ -130,11 +130,16 @@ source_set("lib") {
     "//mojo/services/tracing/public/interfaces",
     "//mojo/shell",
     "//mojo/util:filename_util",
-    "//third_party/mojo/src/mojo/edk/system",
     "//ui/gl",
     "//url",
   ]
 
+  if (use_chrome_edk) {
+    deps += [ "//mojo/edk/system" ]
+  } else {
+    deps += [ "//third_party/mojo/src/mojo/edk/system" ]
+  }
+
   if (is_linux && !is_android) {
     sources += [
       "linux_sandbox.cc",
@@ -447,11 +452,16 @@ test("mojo_runner_unittests") {
     "//mojo/shell",
     "//mojo/util:filename_util",
     "//testing/gtest",
-    "//third_party/mojo/src/mojo/edk/system",
     "//third_party/mojo/src/mojo/public/cpp/bindings",
     "//url",
   ]
 
+  if (use_chrome_edk) {
+    deps += [ "//mojo/edk/system" ]
+  } else {
+    deps += [ "//third_party/mojo/src/mojo/edk/system" ]
+  }
+
   data_deps = [
     "//mojo/services/test_service:test_app",
     "//mojo/services/test_service:test_request_tracker_app",