Mojo: Add BindingsSupportImpl on top of HandleWatcher

mojo/public/tests/simple_bindings_support.h

Index: mojo/public/tests/simple_bindings_support.h
diff --git a/mojo/public/tests/simple_bindings_support.h b/mojo/public/tests/simple_bindings_support.h
index c22de82f35f2a9ed8037b3c1774e42a7b46a7cb3..59131ba185b0e6750aadfebaa83bbbabb28c7e45 100644
--- a/mojo/public/tests/simple_bindings_support.h
+++ b/mojo/public/tests/simple_bindings_support.h
@@ -17,11 +17,10 @@ class SimpleBindingsSupport : public BindingsSupport {
   SimpleBindingsSupport();
   virtual ~SimpleBindingsSupport();
 
-  virtual bool AsyncWait(Handle handle,
-                         MojoWaitFlags flags,
-                         MojoDeadline deadline,
-                         AsyncWaitCallback* callback) MOJO_OVERRIDE;
-  virtual void CancelWait(AsyncWaitCallback* callback) MOJO_OVERRIDE;
+  virtual AsyncWaitID AsyncWait(Handle handle,
+                                MojoWaitFlags flags,
+                                AsyncWaitCallback* callback) MOJO_OVERRIDE;
+  virtual void CancelWait(AsyncWaitID async_wait_id) MOJO_OVERRIDE;
 
   // This method is called by unit tests to check the status of any handles
   // that we are asynchronously waiting on and to dispatch callbacks for any
@@ -34,11 +33,11 @@ class SimpleBindingsSupport : public BindingsSupport {
   struct Waiter {
     Handle handle;
     MojoWaitFlags flags;
-    MojoDeadline deadline;
     AsyncWaitCallback* callback;
   };
 
-  std::list<Waiter> waiters_;
+  typedef std::list<Waiter*> WaiterList;
+  WaiterList waiters_;
 };
 
 }  // namespace test