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

third_party/mojo/mojo_edk.gyp

 # 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.
 
 {
   'includes': [
     'mojo_variables.gypi',
   ],
   'target_defaults' : {
     'include_dirs': [
+      # TODO(use_chrome_edk): since we include a few headers from src/mojo/edk,
+      # we need their includes to be searched first (i.e. otherwise when
+      # embedder.cc in third_party includes core.h from src/mojo/edk, and the
+      # latter includes mojo/edk/system/memory.h, the header from third_party
+      # would incorrectly get chosen).
+      '../..',
       'src',
     ],
     'direct_dependent_settings': {
       'include_dirs': [
         'src',
       ],
     },
   },
   'targets': [
     {
       # GN version: //mojo/edk/system
       'target_name': 'mojo_system_impl',
       'type': '<(component)',
       'dependencies': [
         '../../base/base.gyp:base',
         '../../base/third_party/dynamic_annotations/dynamic_annotations.gyp:dynamic_annotations',
+        # TODO(use_chrome_edk): so that EDK in third_party can choose the EDK in
+        # src/mojo if the command line flag is specified. It has to since we can
+        # only have one definition of the Mojo primitives.
+        '../../mojo/mojo_edk.gyp:mojo_system_impl2',
       ],
       'includes': [
         'mojo_edk_system_impl.gypi',
       ],
     },
     {
       # GN version: //mojo/edk/js
       'target_name': 'mojo_js_lib',
       'type': 'static_library',
       'dependencies': [
@@ skipping 110 matching lines @@
           'configurations': {
             'Common_Base': {
               'msvs_target_platform': 'x64',
             },
           },
         },
       ],
     }],
   ],
 }