Rename "test" ozone platform to "headless"

ui/ozone/platform/eglheadless/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("//tools/generate_library_loader/generate_library_loader.gni")
 import("//ui/ozone/ozone.gni")
 
-source_set("egltest") {
+source_set("eglheadless") {
   sources = [
-    "client_native_pixmap_factory_egltest.cc",
-    "client_native_pixmap_factory_egltest.h",
-    "ozone_platform_egltest.cc",
-    "ozone_platform_egltest.h",
+    "client_native_pixmap_factory_eglheadless.cc",
+    "client_native_pixmap_factory_eglheadless.h",
+    "ozone_platform_eglheadless.cc",
+    "ozone_platform_eglheadless.h",
   ]
 
   deps = [
     ":eglplatform_shim",
     "//base",
     "//ui/events/devices",
     "//ui/events/ozone:events_ozone_evdev",
     "//ui/events/ozone:events_ozone_layout",
     "//ui/events/platform",
     "//ui/gfx",
   ]
 }
 
 generate_library_loader("eglplatform_shim") {
   name = "LibeglplatformShimLoader"
   output_h = "libeglplatform_shim.h"
   output_cc = "libeglplatform_shim_loader.cc"
-  header = "\"ui/ozone/platform/egltest/eglplatform_shim.h\""
+  header = "\"ui/ozone/platform/eglheadless/eglplatform_shim.h\""
 
   functions = [
     "ShimQueryString",
     "ShimInitialize",
     "ShimTerminate",
     "ShimCreateWindow",
     "ShimQueryWindow",
     "ShimDestroyWindow",
     "ShimGetNativeDisplay",
     "ShimGetNativeWindow",
     "ShimReleaseNativeWindow",
   ]
 }
 
 # TODO(spang): eglplatform_shim_x11 should become a loadable_module once
 # support lands: http://crbug.com/380327. Until then, it is not valid on
 # platforms other than Linux.
 
-# GYP version: "ui/ozone/platform/egltest/egltest.gypi:eglplatform_shim_x11"
+# GYP version: "ui/ozone/platform/eglheadless/eglheadless.gypi:eglplatform_shim_x11"
 if (is_linux && ozone_platform_ozonex) {
   shared_library("eglplatform_shim_x11") {
     output_name = "libeglplatform_shim"
 
     output_extension = "so.1"
 
     sources = [
       "eglplatform_shim.h",
       "eglplatform_shim_xeleven.cc",
     ]
 
     configs += [ "//build/config/linux:x11" ]
 
     deps = [
       "//build/config/sanitizers:deps",
     ]
   }
 }