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

mojo/runner/context.cc

Index: mojo/runner/context.cc
diff --git a/mojo/runner/context.cc b/mojo/runner/context.cc
index b6d78e333d17a9def89f69a54854344420758ecb..752606f62d1d3b20b7011599e5cd3902c9389fb1 100644
--- a/mojo/runner/context.cc
+++ b/mojo/runner/context.cc
@@ -27,8 +27,6 @@
 #include "mojo/application/public/cpp/application_impl.h"
 #include "mojo/common/trace_controller_impl.h"
 #include "mojo/common/tracing_impl.h"
-#include "mojo/edk/embedder/embedder.h"
-#include "mojo/edk/embedder/simple_platform_support.h"
 #include "mojo/package_manager/package_manager_impl.h"
 #include "mojo/runner/in_process_native_runner.h"
 #include "mojo/runner/out_of_process_native_runner.h"
@@ -42,6 +40,14 @@
 #include "mojo/util/filename_util.h"
 #include "url/gurl.h"
 
+#if defined(USE_CHROME_EDK)
+#include "mojo/edk/embedder/embedder.h"
+#include "mojo/edk/embedder/simple_platform_support.h"
+#else
+#include "third_party/mojo/src/mojo/edk/embedder/embedder.h"
+#include "third_party/mojo/src/mojo/edk/embedder/simple_platform_support.h"
+#endif
+
 namespace mojo {
 namespace runner {
 namespace {