Mojo: Allow dispatchers to attach PlatformHandles to the MessageInTransit on serialization.

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 519d3c6e1e99409947600a6a144fb060867bfacd..3c94c8aca5a067772f2866e170a04a00a030656f 100644
--- a/mojo/system/shared_buffer_dispatcher.cc
+++ b/mojo/system/shared_buffer_dispatcher.cc
@@ -71,12 +71,14 @@ SharedBufferDispatcher::~SharedBufferDispatcher() {
 }
 
 void SharedBufferDispatcher::CloseImplNoLock() {
+  lock().AssertAcquired();
   DCHECK(shared_buffer_);
   shared_buffer_ = NULL;
 }
 
 scoped_refptr<Dispatcher>
     SharedBufferDispatcher::CreateEquivalentDispatcherAndCloseImplNoLock() {
+  lock().AssertAcquired();
   DCHECK(shared_buffer_);
   scoped_refptr<RawSharedBuffer> shared_buffer;
   shared_buffer.swap(shared_buffer_);
@@ -86,6 +88,7 @@ scoped_refptr<Dispatcher>
 MojoResult SharedBufferDispatcher::DuplicateBufferHandleImplNoLock(
     const MojoDuplicateBufferHandleOptions* options,
     scoped_refptr<Dispatcher>* new_dispatcher) {
+  lock().AssertAcquired();
   if (options) {
     // The |struct_size| field must be valid to read.
     if (!VerifyUserPointer<uint32_t>(&options->struct_size, 1))
@@ -108,6 +111,7 @@ MojoResult SharedBufferDispatcher::MapBufferImplNoLock(
     uint64_t num_bytes,
     MojoMapBufferFlags flags,
     scoped_ptr<RawSharedBufferMapping>* mapping) {
+  lock().AssertAcquired();
   DCHECK(shared_buffer_);
 
   if (offset > static_cast<uint64_t>(std::numeric_limits<size_t>::max()))