mustash: Move gpu/ipc to gpu/ipc/common

gpu/ipc/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.
-
-group("ipc") {
-  if (is_component_build) {
-    public_deps = [
-      "//gpu",
-    ]
-  } else {
-    public_deps = [
-      ":ipc_sources",
-    ]
-  }
-}
-
-source_set("ipc_sources") {
-  visibility = [ "//gpu/*" ]
-
-  sources = [
-    "gpu_command_buffer_traits.cc",
-    "gpu_command_buffer_traits.h",
-    "id_type_traits.h",
-  ]
-
-  configs += [
-    "//gpu:gpu_implementation",
-    "//third_party/khronos:khronos_headers",
-  ]
-
-  deps = [
-    "//gpu/command_buffer/common:common_sources",
-    "//ipc",
-  ]
-}