cc: Move surfaces hittesting test helpers out to a separate file

cc/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("//testing/test.gni")
 
 component("cc") {
   sources = [
     "animation/animation.cc",
     "animation/animation.h",
@@ skipping 619 matching lines @@
     "test/pixel_test_utils.cc",
     "test/pixel_test_utils.h",
     "test/render_pass_test_utils.cc",
     "test/render_pass_test_utils.h",
     "test/scheduler_test_common.cc",
     "test/scheduler_test_common.h",
     "test/skia_common.cc",
     "test/skia_common.h",
     "test/solid_color_content_layer_client.cc",
     "test/solid_color_content_layer_client.h",
+    "test/surface_aggregator_test_helpers.cc",
+    "test/surface_aggregator_test_helpers.h",
+    "test/surface_hittest_test_helpers.cc",
+    "test/surface_hittest_test_helpers.h",
     "test/test_context_provider.cc",
     "test/test_context_provider.h",
     "test/test_context_support.cc",
     "test/test_context_support.h",
     "test/test_gles2_interface.cc",
     "test/test_gles2_interface.h",
     "test/test_gpu_memory_buffer_manager.cc",
     "test/test_gpu_memory_buffer_manager.h",
     "test/test_image_factory.cc",
     "test/test_image_factory.h",
@@ skipping 182 matching lines @@
     "trees/layer_tree_host_unittest_video.cc",
     "trees/layer_tree_impl_unittest.cc",
     "trees/occlusion_tracker_unittest.cc",
     "trees/occlusion_unittest.cc",
     "trees/property_tree_unittest.cc",
     "trees/tree_synchronizer_unittest.cc",
 
     # Surfaces test files.
     "surfaces/display_scheduler_unittest.cc",
     "surfaces/display_unittest.cc",
-    "surfaces/surface_aggregator_test_helpers.cc",
-    "surfaces/surface_aggregator_test_helpers.h",
     "surfaces/surface_aggregator_unittest.cc",
     "surfaces/surface_display_output_surface_unittest.cc",
     "surfaces/surface_factory_unittest.cc",
     "surfaces/surface_hittest_unittest.cc",
     "surfaces/surface_unittest.cc",
     "surfaces/surfaces_pixeltest.cc",
 
     # Setup.
     "test/cc_test_suite.cc",
     "test/run_all_unittests.cc",
@@ skipping 69 matching lines @@
     "//ui/gl",
     "//ui/gl:test_support",
   ]
 
   if (is_android) {
     isolate_file = "cc_perftests.isolate"
   }
 }
 # When adding support for isolates, please have a look at run-time dependencies
 # in the cc_unittests_run target in cc_tests.gyp.