mus: Use BufferQueue and GLHelper from display_compositor.

components/mus/gles2/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")
 
 source_set("gles2") {
   visibility = [
     "//components/mus:*",
     "//components/mus/ws:*",
     "//components/mus/surfaces:*",
     "//services/shell/standalone:lib",  # For android
   ]
 
   sources = [
     "command_buffer_driver.cc",
     "command_buffer_driver.h",
     "command_buffer_driver_manager.cc",
     "command_buffer_driver_manager.h",
     "command_buffer_impl.cc",
     "command_buffer_impl.h",
     "command_buffer_local.cc",
     "command_buffer_local.h",
     "command_buffer_local_client.h",
     "command_buffer_task_runner.cc",
     "command_buffer_task_runner.h",
-    "gl_helper.cc",
-    "gl_helper.h",
     "gl_surface_adapter.cc",
     "gl_surface_adapter.h",
     "gpu_impl.cc",
     "gpu_impl.h",
     "gpu_memory_tracker.cc",
     "gpu_memory_tracker.h",
     "gpu_state.cc",
     "gpu_state.h",
   ]
 
@@ skipping 57 matching lines @@
     "//gpu/command_buffer/common",
     "//gpu/config:config",
     "//mojo/public/cpp/bindings",
     "//mojo/public/cpp/system",
     "//ui/gfx",
     "//ui/gfx/geometry",
   ]
 
   include_dirs = [ "../.." ]
 }