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

mojo/edk/system/dispatcher_unittest.cc

Index: mojo/edk/system/dispatcher_unittest.cc
diff --git a/third_party/mojo/src/mojo/edk/system/dispatcher_unittest.cc b/mojo/edk/system/dispatcher_unittest.cc
similarity index 98%
copy from third_party/mojo/src/mojo/edk/system/dispatcher_unittest.cc
copy to mojo/edk/system/dispatcher_unittest.cc
index c6431ffea7b71302fad99b0bcbe46003b5afd2d2..7c2ea062dc43e1935ac93c6db5eb9fff9d43790c 100644
--- a/third_party/mojo/src/mojo/edk/system/dispatcher_unittest.cc
+++ b/mojo/edk/system/dispatcher_unittest.cc
@@ -15,7 +15,7 @@
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace mojo {
-namespace system {
+namespace edk {
 namespace {
 
 // Trivial subclass that makes the constructor public.
@@ -31,7 +31,7 @@ class TrivialDispatcher final : public Dispatcher {
 
   scoped_refptr<Dispatcher> CreateEquivalentDispatcherAndCloseImplNoLock()
       override {
-    mutex().AssertHeld();
+    lock().AssertAcquired();
     return scoped_refptr<Dispatcher>(new TrivialDispatcher());
   }
 
@@ -204,7 +204,7 @@ class ThreadSafetyStressThread : public base::SimpleThread {
         break;
       }
       case MAP_BUFFER: {
-        scoped_ptr<embedder::PlatformSharedBufferMapping> unused;
+        scoped_ptr<PlatformSharedBufferMapping> unused;
         EXPECT_EQ(
             MOJO_RESULT_INVALID_ARGUMENT,
             dispatcher_->MapBuffer(0u, 0u, MOJO_MAP_BUFFER_FLAG_NONE, &unused));
@@ -303,5 +303,5 @@ TEST(DispatcherTest, ThreadSafetyStressNoClose) {
 }
 
 }  // namespace
-}  // namespace system
+}  // namespace edk
 }  // namespace mojo