Mojo C++ Bindings: Add helpers for bad message reporting

mojo/edk/system/core.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_EDK_SYSTEM_CORE_H_
 #define MOJO_EDK_SYSTEM_CORE_H_
 
 #include <memory>
 #include <vector>
 
@@ skipping 33 matching lines @@
 
   // Called exactly once, shortly after construction, and before any other
   // methods are called on this object.
   void SetIOTaskRunner(scoped_refptr<base::TaskRunner> io_task_runner);
 
   // Retrieves the NodeController for the current process.
   NodeController* GetNodeController();
 
   scoped_refptr<Dispatcher> GetDispatcher(MojoHandle handle);
 
+  void SetDefaultProcessErrorCallback(const ProcessErrorCallback& callback);
+
   // Called in the parent process any time a new child is launched.
   void AddChild(base::ProcessHandle process_handle,
                 ScopedPlatformHandle platform_handle,
                 const std::string& child_token,
                 const ProcessErrorCallback& process_error_callback);
 
   // Called in the parent process when a child process fails to launch.
   void ChildLaunchFailed(const std::string& child_token);
 
   // Called in a child process exactly once during early initialization.
@@ skipping 219 matching lines @@
   // Otherwise it's effectively const and shouldn't need to be guarded.
   //
   // We can get rid of lazy initialization if we defer Mojo initialization far
   // enough that zygotes don't do it. The zygote can't create a NodeController.
   base::Lock node_controller_lock_;
 
   // This is lazily initialized on first access. Always use GetNodeController()
   // to access it.
   std::unique_ptr<NodeController> node_controller_;
 
+  // The default callback to invoke, if any, when a process error is reported
+  // but cannot be associated with a specific process.
+  ProcessErrorCallback default_process_error_callback_;
+
   base::Lock handles_lock_;
   HandleTable handles_;
 
   base::Lock mapping_table_lock_;  // Protects |mapping_table_|.
   MappingTable mapping_table_;
 
   base::Lock property_lock_;
   // Properties that can be read using the MojoGetProperty() API.
   bool property_sync_call_allowed_ = true;
 
   DISALLOW_COPY_AND_ASSIGN(Core);
 };
 
 }  // namespace edk
 }  // namespace mojo
 
 #endif  // MOJO_EDK_SYSTEM_CORE_H_