Add a perf test for async wait and fix a bug in mojo::RunLoop.

mojo/BUILD.gn

 # 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.
 
 import("//build/config/nacl/config.gni")
 import("//build/module_args/mojo.gni")
 import("//mojo/public/mojo.gni")
 import("//testing/test.gni")
 
 declare_args() {
@@ skipping 94 matching lines @@
     ":mojo_public_c_system_unittests",
     ":mojo_public_cpp_application_unittests",
     ":mojo_public_cpp_bindings_unittests",
     ":mojo_public_cpp_environment_unittests",
     ":mojo_public_cpp_system_unittests",
     ":mojo_public_cpp_utility_unittests",
 
     # Perf tests:
     ":mojo_public_c_system_perftests",
     ":mojo_public_cpp_bindings_perftests",
+    ":mojo_public_cpp_environment_perftests",
   ]
 }
 
 # C unit tests:
 
 test("mojo_public_c_bindings_unittests") {
   deps = [
     "//mojo/edk/test:run_all_unittests",
     "//mojo/public/c/bindings/tests",
   ]
@@ skipping 53 matching lines @@
 }
 
 # C++ perf tests:
 
 test("mojo_public_cpp_bindings_perftests") {
   deps = [
     "//mojo/edk/test:run_all_perftests",
     "//mojo/public/cpp/bindings/tests:perftests",
   ]
 }
+
+test("mojo_public_cpp_environment_perftests") {
+  deps = [
+    "//mojo/edk/test:run_all_perftests",
+    "//mojo/public/cpp/environment/tests:perftests",
+  ]
+}