Mojo: Add a platform interface for shared memory (embedder::PlatformSharedBuffer).

mojo/system/dispatcher_unittest.cc

Index: mojo/system/dispatcher_unittest.cc
diff --git a/mojo/system/dispatcher_unittest.cc b/mojo/system/dispatcher_unittest.cc
index 888af3c06b0b29ba4bc693f37e9bfc521d4a1484..1a7bba5759fca9bfc61f5ac4465276b76ed4aeca 100644
--- a/mojo/system/dispatcher_unittest.cc
+++ b/mojo/system/dispatcher_unittest.cc
@@ -9,8 +9,8 @@
 #include "base/memory/scoped_vector.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/threading/simple_thread.h"
+#include "mojo/embedder/platform_shared_buffer.h"
 #include "mojo/system/memory.h"
-#include "mojo/system/raw_shared_buffer.h"
 #include "mojo/system/waiter.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ -223,7 +223,7 @@ class ThreadSafetyStressThread : public base::SimpleThread {
         break;
       }
       case MAP_BUFFER: {
-        scoped_ptr<RawSharedBufferMapping> unused;
+        scoped_ptr<embedder::PlatformSharedBufferMapping> unused;
         EXPECT_EQ(
             MOJO_RESULT_INVALID_ARGUMENT,
             dispatcher_->MapBuffer(0u, 0u, MOJO_MAP_BUFFER_FLAG_NONE, &unused));