Mojo: Make default Options directly accessible.

mojo/system/data_pipe.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MOJO_SYSTEM_DATA_PIPE_H_
 #define MOJO_SYSTEM_DATA_PIPE_H_
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 10 matching lines @@
 
 // |DataPipe| is a base class for secondary objects implementing data pipes,
 // similar to |MessagePipe| (see the explanatory comment in core.cc). It is
 // typically owned by the dispatcher(s) corresponding to the local endpoints.
 // Its subclasses implement the three cases: local producer and consumer, local
 // producer and remote consumer, and remote producer and local consumer. This
 // class is thread-safe.
 class MOJO_SYSTEM_IMPL_EXPORT DataPipe :
     public base::RefCountedThreadSafe<DataPipe> {
  public:
+  // The default options to use for the constructor (and subclasses'
+  // constructors). (Real uses should obtain this via |ValidateCreateOptions()|
+  // with a null |in_options|; this is exposed directly for testing
+  // convenience.)
+  static const MojoCreateDataPipeOptions kDefaultCreateOptions;
+
   // Validates and/or sets default options for |MojoCreateDataPipeOptions|. If
   // non-null, |in_options| must point to a struct of at least
   // |in_options->struct_size| bytes. |out_options| must point to a (current)
   // |MojoCreateDataPipeOptions| and will be entirely overwritten on success (it
   // may be partly overwritten on failure).
   static MojoResult ValidateCreateOptions(
       const MojoCreateDataPipeOptions* in_options,
       MojoCreateDataPipeOptions* out_options);
 
   // These are called by the producer dispatcher to implement its methods of
@@ skipping 147 matching lines @@
   uint32_t producer_two_phase_max_num_bytes_written_;
   uint32_t consumer_two_phase_max_num_bytes_read_;
 
   DISALLOW_COPY_AND_ASSIGN(DataPipe);
 };
 
 }  // namespace system
 }  // namespace mojo
 
 #endif  // MOJO_SYSTEM_DATA_PIPE_H_