Mojo: Add Dispatcher::{DuplicateBufferHandle,MapBuffer} methods.

mojo/system/dispatcher.cc

Index: mojo/system/dispatcher.cc
diff --git a/mojo/system/dispatcher.cc b/mojo/system/dispatcher.cc
index acf42eebc5f0af0acafb2b71b56c77dd8937979e..ac02b8347abd7ff58247886246574a2357a17019 100644
--- a/mojo/system/dispatcher.cc
+++ b/mojo/system/dispatcher.cc
@@ -125,6 +125,27 @@ MojoResult Dispatcher::EndReadData(uint32_t num_bytes_read) {
   return EndReadDataImplNoLock(num_bytes_read);
 }
 
+MojoResult Dispatcher::DuplicateBufferHandle(
+    const MojoDuplicateBufferHandleOptions* options,
+    scoped_refptr<Dispatcher>* new_dispatcher) {
+  base::AutoLock locker(lock_);
+  if (is_closed_)
+    return MOJO_RESULT_INVALID_ARGUMENT;
+
+  return DuplicateBufferHandleImplNoLock(options, new_dispatcher);
+}
+
+MojoResult Dispatcher::MapBuffer(uint64_t offset,
+                                 uint64_t num_bytes,
+                                 void** buffer,
+                                 MojoMapBufferFlags flags) {
+  base::AutoLock locker(lock_);
+  if (is_closed_)
+    return MOJO_RESULT_INVALID_ARGUMENT;
+
+  return MapBufferImplNoLock(offset, num_bytes, buffer, flags);
+}
+
 MojoResult Dispatcher::AddWaiter(Waiter* waiter,
                                  MojoWaitFlags flags,
                                  MojoResult wake_result) {
@@ -240,6 +261,25 @@ MojoResult Dispatcher::EndReadDataImplNoLock(uint32_t /*num_bytes_read*/) {
   return MOJO_RESULT_INVALID_ARGUMENT;
 }
 
+MojoResult Dispatcher::DuplicateBufferHandleImplNoLock(
+      const MojoDuplicateBufferHandleOptions* /*options*/,
+      scoped_refptr<Dispatcher>* /*new_dispatcher*/) {
+  lock_.AssertAcquired();
+  DCHECK(!is_closed_);
+  // By default, not supported. Only needed for buffer dispatchers.
+  return MOJO_RESULT_INVALID_ARGUMENT;
+}
+
+MojoResult Dispatcher::MapBufferImplNoLock(uint64_t /*offset*/,
+                                           uint64_t /*num_bytes*/,
+                                           void** /*buffer*/,
+                                           MojoMapBufferFlags /*flags*/) {
+  lock_.AssertAcquired();
+  DCHECK(!is_closed_);
+  // By default, not supported. Only needed for buffer dispatchers.
+  return MOJO_RESULT_INVALID_ARGUMENT;
+}
+
 MojoResult Dispatcher::AddWaiterImplNoLock(Waiter* /*waiter*/,
                                            MojoWaitFlags /*flags*/,
                                            MojoResult /*wake_result*/) {