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

mojo/system/shared_buffer_dispatcher.cc

Index: mojo/system/shared_buffer_dispatcher.cc
diff --git a/mojo/system/shared_buffer_dispatcher.cc b/mojo/system/shared_buffer_dispatcher.cc
index e5c4059953eeedc6f3da4684641f1a50f37696e7..7e046d7aea97ef410663607f0728569c768420f7 100644
--- a/mojo/system/shared_buffer_dispatcher.cc
+++ b/mojo/system/shared_buffer_dispatcher.cc
@@ -70,7 +70,8 @@ MojoResult SharedBufferDispatcher::Create(
   if (num_bytes > kMaxSharedMemoryNumBytes)
     return MOJO_RESULT_RESOURCE_EXHAUSTED;
 
-  scoped_refptr<RawSharedBuffer> shared_buffer(
+  // TODO(vtl): Call out to "platform support" for this.
+  scoped_refptr<embedder::PlatformSharedBuffer> shared_buffer(
       RawSharedBuffer::Create(static_cast<size_t>(num_bytes)));
   if (!shared_buffer)
     return MOJO_RESULT_RESOURCE_EXHAUSTED;
@@ -119,7 +120,7 @@ scoped_refptr<SharedBufferDispatcher> SharedBufferDispatcher::Deserialize(
 
   // Wrapping |platform_handle| in a |ScopedPlatformHandle| means that it'll be
   // closed even if creation fails.
-  scoped_refptr<RawSharedBuffer> shared_buffer(
+  scoped_refptr<embedder::PlatformSharedBuffer> shared_buffer(
       RawSharedBuffer::CreateFromPlatformHandle(
           num_bytes, embedder::ScopedPlatformHandle(platform_handle)));
   if (!shared_buffer) {
@@ -133,7 +134,7 @@ scoped_refptr<SharedBufferDispatcher> SharedBufferDispatcher::Deserialize(
 }
 
 SharedBufferDispatcher::SharedBufferDispatcher(
-    scoped_refptr<RawSharedBuffer> shared_buffer)
+    scoped_refptr<embedder::PlatformSharedBuffer> shared_buffer)
     : shared_buffer_(shared_buffer) {
   DCHECK(shared_buffer_);
 }
@@ -183,7 +184,7 @@ scoped_refptr<Dispatcher>
 SharedBufferDispatcher::CreateEquivalentDispatcherAndCloseImplNoLock() {
   lock().AssertAcquired();
   DCHECK(shared_buffer_);
-  scoped_refptr<RawSharedBuffer> shared_buffer;
+  scoped_refptr<embedder::PlatformSharedBuffer> shared_buffer;
   shared_buffer.swap(shared_buffer_);
   return scoped_refptr<Dispatcher>(new SharedBufferDispatcher(shared_buffer));
 }
@@ -206,7 +207,7 @@ MojoResult SharedBufferDispatcher::MapBufferImplNoLock(
     uint64_t offset,
     uint64_t num_bytes,
     MojoMapBufferFlags flags,
-    scoped_ptr<RawSharedBufferMapping>* mapping) {
+    scoped_ptr<embedder::PlatformSharedBufferMapping>* mapping) {
   lock().AssertAcquired();
   DCHECK(shared_buffer_);
 
@@ -258,7 +259,7 @@ bool SharedBufferDispatcher::EndSerializeAndCloseImplNoLock(
     return false;
   }
 
-  serialization->num_bytes = shared_buffer_->num_bytes();
+  serialization->num_bytes = shared_buffer_->GetNumBytes();
   serialization->platform_handle_index = platform_handles->size();
   platform_handles->push_back(platform_handle.release());
   *actual_size = sizeof(SerializedSharedBufferDispatcher);