Add perf tests for async waits using base::MessageLoop.

mojo/environment/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("//mojo/public/mojo_application.gni")
+import("//testing/test.gni")
+
 source_set("chromium") {
   sources = [
     "default_async_waiter.cc",
     "default_async_waiter.h",
     "default_logger.cc",
     "default_logger.h",
     "environment.cc",
     "scoped_chromium_init.cc",
     "scoped_chromium_init.h",
 
     # TODO(vtl): This is kind of ugly. (See TODO in logging.h.)
     "../public/cpp/environment/async_waiter.h",
     "../public/cpp/environment/lib/async_waiter.cc",
     "../public/cpp/environment/lib/logging.cc",
     "../public/cpp/environment/logging.h",
   ]
 
   deps = [
     "//base",
     "//base/third_party/dynamic_annotations",
     "//mojo/common",
     "//mojo/message_pump",
     "//mojo/public/c/environment",
     "//mojo/public/cpp/bindings:callback",
     "//mojo/public/cpp/environment",
     "//mojo/public/cpp/system",
   ]
 }
+
+# TODO(vtl): Just build this as an executable/non-apptest for now. (This
+# requires depending //mojo/edk/test:run_all_perftests, which is undesirable.
+# However, we don't have a good way to automatically run perf tests that are
+# apptests and extract results.)
+test("mojo_environment_perftests") {
+  sources = [
+    "async_wait_perftest.cc",
+  ]
+
+  deps = [
+    ":chromium",
+    "//base",
+    "//base/test:test_support",
+    "//mojo/edk/test:run_all_perftests",
+    "//mojo/message_pump",
+    "//mojo/public/c/environment/tests:perftest_helpers",
+    "//mojo/public/cpp/environment",
+    "//testing/gtest",
+  ]
+}