Content "gn check" work.

gpu/ipc/common/BUILD.gn

 # Copyright 2016 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")
 
 group("common") {
   if (is_component_build) {
     public_deps = [
       "//gpu",
@@ skipping 11 matching lines @@
       "//gpu",
     ]
   } else {
     public_deps = [
       ":command_buffer_traits_sources",
     ]
   }
 }
 
 source_set("command_buffer_traits_sources") {
+  # External code should depend on this via
+  # //gpu/ipc/common:command_buffer_traits above rather than depending on this
+  # directly or the component build will break.
   visibility = [ "//gpu/*" ]
 
   sources = [
     "gpu_command_buffer_traits.cc",
     "gpu_command_buffer_traits.h",
     "gpu_command_buffer_traits_multi.h",
     "id_type_traits.h",
   ]
 
   configs += [
     "//gpu:gpu_implementation",
     "//third_party/khronos:khronos_headers",
   ]
 
   deps = [
     "//base",
     "//gpu/command_buffer/common:common_sources",
     "//ipc",
   ]
 }
 
 source_set("ipc_common_sources") {
+  # External code should depend on this via //gpu/ipc/common above rather than
+  # depending on this directly or the component build will break.
   visibility = [ "//gpu/*" ]
 
   sources = [
     "gpu_memory_buffer_support.cc",
     "gpu_memory_buffer_support.h",
     "gpu_memory_uma_stats.h",
     "gpu_message_generator.cc",
     "gpu_message_generator.h",
     "gpu_messages.h",
     "gpu_param_traits.cc",
@@ skipping 10 matching lines @@
     "//gpu:gpu_implementation",
     "//third_party/khronos:khronos_headers",
   ]
 
   deps = [
     ":command_buffer_traits_sources",
     "//base",
     "//gpu/command_buffer/common:common_sources",
     "//gpu/config:config_sources",
     "//ipc",
-    "//ui/events/ipc:events_ipc",
+    "//ui/events/ipc",
     "//ui/gfx/ipc",
     "//ui/gl",
     "//url/ipc:url_ipc",
   ]
 
   if (is_android) {
     sources += [
       "android/surface_texture_manager.cc",
       "android/surface_texture_manager.h",
       "android/surface_texture_peer.cc",
       "android/surface_texture_peer.h",
     ]
   }
 
   if (use_ozone) {
     deps += [ "//ui/ozone" ]
   }
 }