[mojo-edk] Add MojoWatch and MojoCancelWatch APIs

mojo/edk/system/handle_table.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.
 
 #ifndef MOJO_EDK_SYSTEM_HANDLE_TABLE_H_
 #define MOJO_EDK_SYSTEM_HANDLE_TABLE_H_
 
 #include <stdint.h>
 
 #include <vector>
@@ skipping 22 matching lines @@
   scoped_refptr<Dispatcher> GetDispatcher(MojoHandle handle) const;
   MojoResult GetAndRemoveDispatcher(MojoHandle,
                                     scoped_refptr<Dispatcher>* dispatcher);
 
   // Marks handles as busy and populates |dispatchers|. Returns MOJO_RESULT_BUSY
   // if any of the handles are already in transit; MOJO_RESULT_INVALID_ARGUMENT
   // if any of the handles are invalid; or MOJO_RESULT_OK if successful.
   MojoResult BeginTransit(
       const MojoHandle* handles,
       uint32_t num_handles,
-      std::vector<Dispatcher::DispatcherInTransit>* dispatchers);
+      std::vector<Dispatcher::DispatcherInTransit>* dispatchers,
+      Dispatcher::RequestContext* request_context);
 
   void CompleteTransitAndClose(
-      const std::vector<Dispatcher::DispatcherInTransit>& dispatchers);
+      const std::vector<Dispatcher::DispatcherInTransit>& dispatchers,
+      Dispatcher::RequestContext* request_context);
+
   void CancelTransit(
-      const std::vector<Dispatcher::DispatcherInTransit>& dispatchers);
+      const std::vector<Dispatcher::DispatcherInTransit>& dispatchers,
+      Dispatcher::RequestContext* request_context);
 
   void GetActiveHandlesForTest(std::vector<MojoHandle> *handles);
 
  private:
   struct Entry {
    Entry();
    explicit Entry(scoped_refptr<Dispatcher> dispatcher);
    ~Entry();
 
    scoped_refptr<Dispatcher> dispatcher;
    bool busy = false;
   };
 
   using HandleMap = base::hash_map<MojoHandle, Entry>;
 
   HandleMap handles_;
 
   uint32_t next_available_handle_ = 1;
 
   DISALLOW_COPY_AND_ASSIGN(HandleTable);
 };
 
 }  // namespace edk
 }  // namespace mojo
 
 #endif  // MOJO_EDK_SYSTEM_HANDLE_TABLE_H_