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

content/app/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/chrome_build.gni")
 
 content_app_sources = [
   "android/app_jni_registrar.cc",
   "android/app_jni_registrar.h",
   "android/child_process_service.cc",
@@ skipping 45 matching lines @@
 if (is_ios) {
   content_app_sources -= [
     "content_main.cc",
     "mojo/mojo_init.cc",
     "mojo/mojo_init.h",
   ]
 } else {
   content_app_deps += [
     "//mojo/application/public/interfaces",
     "//mojo/environment:chromium",
-    "//third_party/mojo/src/mojo/edk/system",
   ]
+
+  if (use_chrome_edk) {
+    content_app_deps += [ "//mojo/edk/system" ]
+  } else {
+    content_app_deps += [ "//third_party/mojo/src/mojo/edk/system" ]
+  }
 }
 
 content_app_extra_configs = [
   "//build/config/compiler:wexit_time_destructors",
   "//content:content_implementation",
 ]
 
 if (!is_multi_dll_chrome) {
   content_app_deps += [ "//content/gpu:gpu_sources" ]
 }
@@ skipping 26 matching lines @@
   source_set("child") {
     visibility = [ "//content/public/app:child" ]
 
     sources = content_app_sources
     configs += content_app_extra_configs
     deps = content_app_deps
 
     defines = [ "CHROME_MULTIPLE_DLL_CHILD" ]
   }
 }