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

chrome/test/base/run_all_unittests.cc

Index: chrome/test/base/run_all_unittests.cc
diff --git a/chrome/test/base/run_all_unittests.cc b/chrome/test/base/run_all_unittests.cc
index 3ab966f9257c4c4ccffd508a4dc3697d2906fd52..c26726cc458a998e1fde34d972ad76131f26919c 100644
--- a/chrome/test/base/run_all_unittests.cc
+++ b/chrome/test/base/run_all_unittests.cc
@@ -6,7 +6,12 @@
 #include "base/test/launcher/unit_test_launcher.h"
 #include "chrome/test/base/chrome_unit_test_suite.h"
 #include "content/public/test/unittest_test_suite.h"
+
+#if defined(USE_CHROME_EDK)
+#include "mojo/edk/embedder/test_embedder.h"
+#else
 #include "third_party/mojo/src/mojo/edk/embedder/test_embedder.h"
+#endif
 
 int main(int argc, char **argv) {
   content::UnitTestTestSuite test_suite(new ChromeUnitTestSuite(argc, argv));