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

mojo/edk/system/waiter_unittest.cc

Index: mojo/edk/system/waiter_unittest.cc
diff --git a/third_party/mojo/src/mojo/edk/system/waiter_unittest.cc b/mojo/edk/system/waiter_unittest.cc
similarity index 96%
copy from third_party/mojo/src/mojo/edk/system/waiter_unittest.cc
copy to mojo/edk/system/waiter_unittest.cc
index 29bd5bcd48a4fc4d1188baf2ad4537483f313a94..68f81062e8174931259cf8e83cb094b921eac3d2 100644
--- a/third_party/mojo/src/mojo/edk/system/waiter_unittest.cc
+++ b/mojo/edk/system/waiter_unittest.cc
@@ -11,8 +11,8 @@
 
 #include <stdint.h>
 
+#include "base/synchronization/lock.h"
 #include "base/threading/simple_thread.h"
-#include "mojo/edk/system/mutex.h"
 #include "mojo/edk/system/test_utils.h"
 #include "mojo/public/cpp/system/macros.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ -41,7 +41,7 @@ class WaitingThread : public base::SimpleThread {
                      MojoDeadline* elapsed) {
     for (;;) {
       {
-        MutexLocker locker(&mutex_);
+        base::AutoLock locker(lock_);
         if (done_) {
           *result = result_;
           *context = context_;
@@ -68,7 +68,7 @@ class WaitingThread : public base::SimpleThread {
     elapsed = stopwatch.Elapsed();
 
     {
-      MutexLocker locker(&mutex_);
+      base::AutoLock locker(lock_);
       done_ = true;
       result_ = result;
       context_ = context;
@@ -79,11 +79,11 @@ class WaitingThread : public base::SimpleThread {
   const MojoDeadline deadline_;
   Waiter waiter_;  // Thread-safe.
 
-  Mutex mutex_;
-  bool done_ MOJO_GUARDED_BY(mutex_);
-  MojoResult result_ MOJO_GUARDED_BY(mutex_);
-  uint32_t context_ MOJO_GUARDED_BY(mutex_);
-  MojoDeadline elapsed_ MOJO_GUARDED_BY(mutex_);
+  base::Lock lock_;  // Protects the following members.
+  bool done_;
+  MojoResult result_;
+  uint32_t context_;
+  MojoDeadline elapsed_;
 
   MOJO_DISALLOW_COPY_AND_ASSIGN(WaitingThread);
 };