ozone: gpu: Add plumbing for platform-specific gpu messaging

content/content_common.gypi

 # Copyright (c) 2012 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.
 
 {
   'dependencies': [
     '../base/base.gyp:base',
     '../components/tracing.gyp:tracing',
     '../gpu/command_buffer/command_buffer.gyp:gles2_utils',
     '../net/net.gyp:net',
@@ skipping 782 matching lines @@
         'common/sandbox_linux/bpf_ppapi_policy_linux.cc',
         'common/sandbox_linux/bpf_ppapi_policy_linux.h',
         'common/sandbox_linux/bpf_renderer_policy_linux.cc',
         'common/sandbox_linux/bpf_renderer_policy_linux.h',
         'common/sandbox_linux/sandbox_bpf_base_policy_linux.cc',
         'common/sandbox_linux/sandbox_bpf_base_policy_linux.h',
       ],
     }, {
       'defines': ['USE_SECCOMP_BPF'],
     }],
+    ['use_ozone==1', {
+      'dependencies': [
+        '../ui/ozone/gpu/ozone_gpu.gyp:ozone_gpu',
+      ],
+    }],
   ],
 }