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

extensions/shell/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("//extensions/shell/app_shell.gni")
 
 # Technically, this directory should not depend on files from src/chrome, but
 # that's where the VERSION file is. This  should probably all be moved to
 # src/build.
 import("//chrome/version.gni")
@@ skipping 39 matching lines @@
     "//extensions/common",
     "//extensions/renderer",
     "//extensions/shell/common/api",
     "//extensions/shell/common/api:api_registration",
     "//extensions/utility",
     "//extensions:extensions_resources",
     "//extensions:shell_and_test_pak",
     "//mojo/environment:chromium",
     "//skia",
     "//third_party/WebKit/public:blink",
-    "//third_party/mojo/src/mojo/edk/system",
     "//ui/base",
     "//ui/base/ime",
     "//v8",
   ]
 
+  if (use_chrome_edk) {
+    deps += [ "//mojo/edk/system" ]
+  } else {
+    deps += [ "//third_party/mojo/src/mojo/edk/system" ]
+  }
+
   sources = rebase_path(app_shell_gypi_values.app_shell_lib_sources,
                         ".",
                         "//extensions/shell")
 
   if (use_aura) {
     deps += [ "//ui/wm" ]
 
     aura_sources = rebase_path(app_shell_gypi_values.app_shell_lib_sources_aura,
                                ".",
                                "//extensions/shell")
@@ skipping 155 matching lines @@
 
   if (is_win) {
     deps += [ "//base/allocator" ]
   }
 }
 
 process_version("version_header") {
   template_file = "common/version.h.in"
   output = "$target_gen_dir/common/version.h"
 }