Convert test_support source sets to static libs

ash/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/features.gni")
 import("//build/config/ui.gni")
 import("//testing/test.gni")
 import("//ui/base/ui_features.gni")
 
 assert(use_aura)
@@ skipping 163 matching lines @@
     "//ui/resources",
     "//ui/strings",
     "//ui/views",
     "//ui/views/controls/webview",
     "//ui/web_dialogs",
     "//url",
   ]
 }
 
 # TODO(msw): Move support code with content deps to test_support_with_content.
-source_set("test_support") {
+static_library("test_support") {
   testonly = true
   sources = gypi_values.ash_test_support_sources
   configs += [ "//build/config:precompiled_headers" ]
 
   public_deps = [
     ":ash",
   ]
   deps = [
     ":test_support_with_content",  # TODO(beng): reverse this direction.
     "//ash/resources",
@@ skipping 35 matching lines @@
   }
 
   if (is_chromeos) {
     deps += [
       "//chromeos",
       "//ui/display",
     ]
   }
 }
 
-source_set("test_support_with_content") {
+static_library("test_support_with_content") {
   testonly = true
   sources = gypi_values.ash_test_support_with_content_sources
   configs += [ "//build/config:precompiled_headers" ]
 
   deps = [
     ":ash_with_content",
     "//content/test:test_support",
     "//skia",
   ]
 }
 
-source_set("interactive_ui_test_support") {
+static_library("interactive_ui_test_support") {
   testonly = true
   configs += [ "//build/config:precompiled_headers" ]
   public_deps = [
     ":ash",
     ":test_support",
   ]
   sources = [
     "test/ash_interactive_ui_test_base.cc",
     "test/ash_interactive_ui_test_base.h",
   ]
@@ skipping 217 matching lines @@
     configs += [ "//build/config/win:windowed" ]
     deps += [ "//sandbox" ]
   }
 
   if (is_chromeos) {
     deps += [ "//device/bluetooth" ]
   }
 }
 # When adding support for isolates, please have a look at run-time dependencies
 # in the ash_unittests_run target in ash.gyp.