Move mojo/public/c/environment/tests to mojo/public/c/tests/environment.

mojo/public/c/BUILD.gn

 # Copyright 2016 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_sdk.gni")
 
 config("c_config") {
   include_dirs = [ "include" ]
 }
 
@@ skipping 43 matching lines @@
   sources = [
     "include/mojo/environment/async_waiter.h",
     "include/mojo/environment/logger.h",
   ]
 
   public_deps = [
     ":system",
   ]
 }
 
+mojo_sdk_source_set("environment_perftest_helpers") {
+  testonly = true
+
+  sources = [
+    "tests/environment/async_waiter_perftest_helpers.cc",
+    "tests/environment/async_waiter_perftest_helpers.h",
+  ]
+
+  public_deps = [
+    ":environment",
+  ]
+
+  mojo_sdk_deps = [ "mojo/public/cpp/system" ]
+}
+
 # system -----------------------------------------------------------------------
 
 # Headers in include/mojo/system (to be included as <mojo/system/HEADER.h>).
 
 mojo_sdk_source_set("system") {
   public_configs = [ ":c_config" ]
 
   sources = [
     "include/mojo/system/buffer.h",
     "include/mojo/system/data_pipe.h",
@@ skipping 74 matching lines @@
 
   cflags = [ "-Wundef" ]
 
   sources = [
     "tests/compile/pure_c.c",
     "tests/compile/pure_cpp.cc",
   ]
 
   mojo_sdk_deps = [ "mojo/public/c:environment" ]
 }