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

mojo/android/BUILD.gn

Index: mojo/android/BUILD.gn
diff --git a/mojo/android/BUILD.gn b/mojo/android/BUILD.gn
index 9519458a093ee184987206d18588411195c7bf63..752441ed9ba297755d1cb8b21e9f49bba4cdc54f 100644
--- a/mojo/android/BUILD.gn
+++ b/mojo/android/BUILD.gn
@@ -47,9 +47,14 @@ source_set("libsystem_java") {
     "//base",
     "//mojo/environment:chromium",
     "//mojo/message_pump",
-    "//third_party/mojo/src/mojo/edk/system",
     "//third_party/mojo/src/mojo/public/cpp/environment",
   ]
+
+  if (use_chrome_edk) {
+    deps += [ "//mojo/edk/system" ]
+  } else {
+    deps += [ "//third_party/mojo/src/mojo/edk/system" ]
+  }
 }
 
 android_library("system_java") {
@@ -127,11 +132,17 @@ shared_library("mojo_java_unittests") {
     "//base/test/:test_support",
     "//build/config/sanitizers:deps",
     "//mojo/message_pump",
-    "//third_party/mojo/src/mojo/edk/system",
     "//third_party/mojo/src/mojo/public/cpp/bindings/tests:mojo_public_bindings_test_utils",
     "//third_party/mojo/src/mojo/public/cpp/test_support:test_utils",
     "//third_party/mojo/src/mojo/public/cpp/environment",
   ]
+
+  if (use_chrome_edk) {
+    deps += [ "//mojo/edk/system" ]
+  } else {
+    deps += [ "//third_party/mojo/src/mojo/edk/system" ]
+  }
+
   defines = [ "UNIT_TEST" ]
 }