Mojo: Add the ability to hook up a channel to the embedder API.

mojo/public/system/core_private.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_PUBLIC_SYSTEM_CORE_PRIVATE_H_
 #define MOJO_PUBLIC_SYSTEM_CORE_PRIVATE_H_
 
 #include "mojo/public/system/core.h"
 
 namespace mojo {
 
 // Implementors of the core APIs can use this interface to install their
 // implementation into the mojo_system dynamic library. Mojo clients should not
 // call these functions directly.
 class MOJO_SYSTEM_EXPORT Core {
  public:
   virtual ~Core();
 
   static void Init(Core* core);
+  static Core* Get();
+  static void Reset();
 
   virtual MojoTimeTicks GetTimeTicksNow() = 0;
   virtual MojoResult Close(MojoHandle handle) = 0;
   virtual MojoResult Wait(MojoHandle handle,
                           MojoWaitFlags flags,
                           MojoDeadline deadline) = 0;
   virtual MojoResult WaitMany(const MojoHandle* handles,
                               const MojoWaitFlags* flags,
                               uint32_t num_handles,
                               MojoDeadline deadline) = 0;
@@ skipping 32 matching lines @@
                                    const void** buffer,
                                    uint32_t* buffer_num_elements,
                                    MojoReadDataFlags flags) = 0;
   virtual MojoResult EndReadData(MojoHandle data_pipe_consumer_handle,
                                  uint32_t num_elements_read) = 0;
 };
 
 }  // namespace mojo
 
 #endif  // MOJO_PUBLIC_SYSTEM_CORE_PRIVATE_H_