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

mojo/edk/js/handle_close_observer.h

Index: mojo/edk/js/handle_close_observer.h
diff --git a/third_party/mojo/src/mojo/edk/js/handle_close_observer.h b/mojo/edk/js/handle_close_observer.h
similarity index 58%
copy from third_party/mojo/src/mojo/edk/js/handle_close_observer.h
copy to mojo/edk/js/handle_close_observer.h
index a7442047dfbf05d0535fbf41e2511cdba9499a24..b507350087d6684e959542a2499e1349a0593338 100644
--- a/third_party/mojo/src/mojo/edk/js/handle_close_observer.h
+++ b/mojo/edk/js/handle_close_observer.h
@@ -2,11 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef THIRD_PARTY_MOJO_SRC_MOJO_EDK_JS_HANDLE_CLOSE_OBSERVER_H_
-#define THIRD_PARTY_MOJO_SRC_MOJO_EDK_JS_HANDLE_CLOSE_OBSERVER_H_
+#ifndef MOJO_EDK_JS_HANDLE_CLOSE_OBSERVER_H_
+#define MOJO_EDK_JS_HANDLE_CLOSE_OBSERVER_H_
 
 namespace mojo {
-namespace js {
+namespace edk {
 
 class HandleCloseObserver {
  public:
@@ -16,7 +16,7 @@ class HandleCloseObserver {
   virtual ~HandleCloseObserver() {}
 };
 
-}  // namespace js
+}  // namespace edk
 }  // namespace mojo
 
-#endif  // THIRD_PARTY_MOJO_SRC_MOJO_EDK_JS_HANDLE_CLOSE_OBSERVER_H_
+#endif  // MOJO_EDK_JS_HANDLE_CLOSE_OBSERVER_H_