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

extensions/BUILD.gn

Index: extensions/BUILD.gn
diff --git a/extensions/BUILD.gn b/extensions/BUILD.gn
index e58246b0983d7aad80f732c58c371f71c862c1b5..ada07339ba47f19224ae194c9bba085497c7b81d 100644
--- a/extensions/BUILD.gn
+++ b/extensions/BUILD.gn
@@ -196,11 +196,21 @@ test("extensions_unittests") {
     "//testing/gmock",
     "//testing/gtest",
     "//third_party/leveldatabase",
-    "//third_party/mojo/src/mojo/edk/js",
-    "//third_party/mojo/src/mojo/edk/system",
     "//third_party/mojo/src/mojo/public/cpp/bindings",
   ]
 
+  if (use_chrome_edk) {
+    deps += [
+      "//mojo/edk/js",
+      "//mojo/edk/system",
+    ]
+  } else {
+    deps += [
+      "//third_party/mojo/src/mojo/edk/js",
+      "//third_party/mojo/src/mojo/edk/system",
+    ]
+  }
+
   data_deps = [ "//third_party/mesa:osmesa" ]
 
   if (is_win) {
@@ -260,11 +270,21 @@ test("extensions_browsertests") {
     "//mojo/environment:chromium",
     "//testing/gmock",
     "//testing/gtest",
-    "//third_party/mojo/src/mojo/edk/js",
-    "//third_party/mojo/src/mojo/edk/system",
     "//third_party/mojo/src/mojo/public/cpp/bindings",
   ]
 
+  if (use_chrome_edk) {
+    deps += [
+      "//mojo/edk/js",
+      "//mojo/edk/system",
+    ]
+  } else {
+    deps += [
+      "//third_party/mojo/src/mojo/edk/js",
+      "//third_party/mojo/src/mojo/edk/system",
+    ]
+  }
+
   data_deps = [ "//third_party/mesa:osmesa" ]
 
   if (is_win) {