Mojo: Plumb new Wait/WaitMany API out to Core.

mojo/system/core.h

Index: mojo/system/core.h
diff --git a/mojo/system/core.h b/mojo/system/core.h
index c71720c1db59e7d177e18dc904be4d356b10c867..d590db2c99875f1a957560d51a0aa1fb64285eef 100644
--- a/mojo/system/core.h
+++ b/mojo/system/core.h
@@ -23,6 +23,7 @@ namespace mojo {
 namespace system {
 
 class Dispatcher;
+struct HandleSignalsState;
 
 // |Core| is an object that implements the Mojo system calls. All public methods
 // are thread-safe.
@@ -45,11 +46,14 @@ class MOJO_SYSTEM_IMPL_EXPORT Core {
   MojoResult Close(MojoHandle handle);
   MojoResult Wait(MojoHandle handle,
                   MojoHandleSignals signals,
-                  MojoDeadline deadline);
+                  MojoDeadline deadline,
+                  UserPointer<MojoHandleSignalsState> signals_state);
   MojoResult WaitMany(UserPointer<const MojoHandle> handles,
                       UserPointer<const MojoHandleSignals> signals,
                       uint32_t num_handles,
-                      MojoDeadline deadline);
+                      MojoDeadline deadline,
+                      UserPointer<uint32_t> result_index,
+                      UserPointer<MojoHandleSignalsState> signals_states);
   MojoResult CreateMessagePipe(
       UserPointer<const MojoCreateMessagePipeOptions> options,
       UserPointer<MojoHandle> message_pipe_handle0,
@@ -116,7 +120,8 @@ class MOJO_SYSTEM_IMPL_EXPORT Core {
                               const MojoHandleSignals* signals,
                               uint32_t num_handles,
                               MojoDeadline deadline,
-                              uint32_t* result_index);
+                              uint32_t* result_index,
+                              HandleSignalsState* signals_states);
 
   // ---------------------------------------------------------------------------