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

mojo/edk/system/message_pipe_unittest.cc

Index: mojo/edk/system/message_pipe_unittest.cc
diff --git a/third_party/mojo/src/mojo/edk/system/message_pipe_unittest.cc b/mojo/edk/system/message_pipe_unittest.cc
similarity index 97%
copy from third_party/mojo/src/mojo/edk/system/message_pipe_unittest.cc
copy to mojo/edk/system/message_pipe_unittest.cc
index 52ace8046b458aa944384ec2fb19822cc1db6397..0866c82629e18e4fc56fe5a2556cae863ccdffbd 100644
--- a/third_party/mojo/src/mojo/edk/system/message_pipe_unittest.cc
+++ b/mojo/edk/system/message_pipe_unittest.cc
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "mojo/edk/system/message_pipe.h"
+//#include "mojo/edk/system/message_pipe.h"
 
 #include "base/memory/ref_counted.h"
 #include "mojo/edk/system/waiter.h"
@@ -13,6 +13,17 @@ namespace mojo {
 namespace system {
 namespace {
 
+static const char kHelloWorld[] = "hello world";
+/* jam embedder_unittest has similar.. look at Basic
+TEST(MessagePipeTest, WriteData) {
+  MojoHandle pipe1, pipe2;
+  ASSERT_EQ(MOJO_RESULT_OK, MojoCreateMessagePipe(nullptr, &pipe1, &pipe2));
+  ASSERT_EQ(MOJO_RESULT_OK,
+            MojoWriteMessage(pipe1, kHelloWorld, sizeof(kHelloWorld), nullptr,
+                             0, MOJO_WRITE_MESSAGE_FLAG_NONE));
+}
+*/
+/*
 const MojoHandleSignals kAllSignals = MOJO_HANDLE_SIGNAL_READABLE |
                                       MOJO_HANDLE_SIGNAL_WRITABLE |
                                       MOJO_HANDLE_SIGNAL_PEER_CLOSED;
@@ -566,7 +577,7 @@ TEST(MessagePipeTest, ThreadedWaiting) {
   EXPECT_EQ(MOJO_RESULT_FAILED_PRECONDITION, result);
   EXPECT_EQ(4u, context);
 }
-
+*/
 }  // namespace
 }  // namespace system
 }  // namespace mojo