Update Context Client Visibility to use Scoped Pattern

gpu/command_buffer/client/BUILD.gn

 # Copyright (c) 2013 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.
 
 # The files here go into the "gpu" component in a component build (with
 # "command_buffer_client" and "gles2_cmd_helper" just forwarding) and goes into
 # separate static libraries in non-component build. This needs to match the
 # GYP build which was likely an attempt to make larger components to help with
 # loading.
 group("client") {
@@ skipping 30 matching lines @@
     "cmd_buffer_helper.h",
     "fenced_allocator.cc",
     "fenced_allocator.h",
     "gpu_control.h",
     "gpu_memory_buffer_manager.cc",
     "gpu_memory_buffer_manager.h",
     "mapped_memory.cc",
     "mapped_memory.h",
     "ring_buffer.cc",
     "ring_buffer.h",
+    "scoped_visibility_impl.cc",
+    "scoped_visibility_impl.h",
     "transfer_buffer.cc",
     "transfer_buffer.h",
   ]
 
   configs += [
     # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
     "//build/config/compiler:no_size_t_to_int_warning",
     "//gpu:gpu_implementation",
   ]
 
@@ skipping 173 matching lines @@
   ]
   deps = [
     ":client",
     ":gles2_implementation_no_check",
     ":gles2_interface",
     "//base",
     "//base/third_party/dynamic_annotations",
     "//gpu/command_buffer/common",
   ]
 }