Fix CompositorResizeLock to do something.

ui/compositor/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/ui.gni")
 import("//testing/test.gni")
 
 component("compositor") {
   sources = [
     "callback_layer_animation_observer.cc",
     "callback_layer_animation_observer.h",
     "canvas_painter.cc",
     "canvas_painter.h",
     "clip_recorder.cc",
     "clip_recorder.h",
     "closure_animation_observer.cc",
     "closure_animation_observer.h",
     "compositing_recorder.cc",
     "compositing_recorder.h",
     "compositor.cc",
     "compositor.h",
     "compositor_animation_observer.h",
     "compositor_export.h",
+    "compositor_lock.cc",
+    "compositor_lock.h",
     "compositor_observer.h",
     "compositor_switches.cc",
     "compositor_switches.h",
     "compositor_vsync_manager.cc",
     "compositor_vsync_manager.h",
     "debug_utils.cc",
     "debug_utils.h",
     "dip_util.cc",
     "dip_util.h",
     "float_animation_curve_adapter.cc",
@@ skipping 69 matching lines @@
   }
 }
 
 static_library("test_support") {
   testonly = true
   sources = [
     "test/context_factories_for_test.cc",
     "test/context_factories_for_test.h",
     "test/draw_waiter_for_test.cc",
     "test/draw_waiter_for_test.h",
+    "test/fake_compositor_lock.cc",
+    "test/fake_compositor_lock.h",
     "test/fake_context_factory.cc",
     "test/fake_context_factory.h",
     "test/in_process_context_factory.cc",
     "test/in_process_context_factory.h",
     "test/in_process_context_provider.cc",
     "test/in_process_context_provider.h",
     "test/layer_animation_observer_test_api.cc",
     "test/layer_animation_observer_test_api.h",
     "test/layer_animator_test_controller.cc",
     "test/layer_animator_test_controller.h",
@@ skipping 84 matching lines @@
     "//ui/base",
     "//ui/gfx",
     "//ui/gfx/geometry",
     "//ui/gl",
     "//ui/resources",
   ]
   if (is_linux) {
     deps += [ "//third_party/mesa:osmesa" ]
   }
 }