Implement MojoGetBufferInformation(), part 2.

mojo/edk/system/core.cc

Index: mojo/edk/system/core.cc
diff --git a/mojo/edk/system/core.cc b/mojo/edk/system/core.cc
index 4a57e0422eba16e5f08e4861f126651f9bc72657..f9bcadcdf05a10af74f7f8e10df8472c64255c75 100644
--- a/mojo/edk/system/core.cc
+++ b/mojo/edk/system/core.cc
@@ -518,6 +518,16 @@ MojoResult Core::DuplicateBufferHandle(
   return MOJO_RESULT_OK;
 }
 
+MojoResult Core::GetBufferInformation(MojoHandle buffer_handle,
+                                      UserPointer<MojoBufferInformation> info,
+                                      uint32_t info_num_bytes) {
+  RefPtr<Dispatcher> dispatcher(GetDispatcher(buffer_handle));
+  if (!dispatcher)
+    return MOJO_RESULT_INVALID_ARGUMENT;
+
+  return dispatcher->GetBufferInformation(info, info_num_bytes);
+}
+
 MojoResult Core::MapBuffer(MojoHandle buffer_handle,
                            uint64_t offset,
                            uint64_t num_bytes,