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

third_party/mojo/mojo_edk.gyp

Index: third_party/mojo/mojo_edk.gyp
diff --git a/third_party/mojo/mojo_edk.gyp b/third_party/mojo/mojo_edk.gyp
index 0b5b475fc9d6e8da2191be16de058e6b17634418..220383c5f5e2742b2c5487e0a8ac034637ba0e9f 100644
--- a/third_party/mojo/mojo_edk.gyp
+++ b/third_party/mojo/mojo_edk.gyp
@@ -8,6 +8,12 @@
   ],
   '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': {
@@ -24,6 +30,10 @@
       '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',