[mojo-edk] Expose notification source to MojoWatch callbacks

mojo/public/c/system/functions.h

 // Copyright 2014 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.
 
 // This file contains basic functions common to different Mojo system APIs.
 //
 // Note: This header should be compilable as C.
 
 #ifndef MOJO_PUBLIC_C_SYSTEM_FUNCTIONS_H_
 #define MOJO_PUBLIC_C_SYSTEM_FUNCTIONS_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include "mojo/public/c/system/system_export.h"
 #include "mojo/public/c/system/types.h"
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
 // A callback used to notify watchers registered via |MojoWatch()|. Called when
 // some watched signals are satisfied or become unsatisfiable. See the
 // documentation for |MojoWatch()| for more details.
 typedef void (*MojoWatchCallback)(uintptr_t context,
                                   MojoResult result,
-                                  struct MojoHandleSignalsState signals_state);
+                                  struct MojoHandleSignalsState signals_state,
+                                  MojoWatchNotificationFlags flags);
 
 // Note: Pointer parameters that are labelled "optional" may be null (at least
 // under some circumstances). Non-const pointer parameters are also labeled
 // "in", "out", or "in/out", to indicate how they are used. (Note that how/if
 // such a parameter is used may depend on other parameters or the requested
 // operation's success/failure. E.g., a separate |flags| parameter may control
 // whether a given "in/out" parameter is used for input, output, or both.)
 
 // Returns the time, in microseconds, since some undefined point in the past.
 // The values are only meaningful relative to other values that were obtained
@@ skipping 165 matching lines @@
 //     |MOJO_RESULT_INVALID_ARGUMENT| if no watch was registered with |context|
 //         for the given |handle|, or if |handle| is invalid.
 MOJO_SYSTEM_EXPORT MojoResult
 MojoCancelWatch(MojoHandle handle, uintptr_t context);
 
 #ifdef __cplusplus
 }  // extern "C"
 #endif
 
 #endif  // MOJO_PUBLIC_C_SYSTEM_FUNCTIONS_H_