linux: implement gpu plugin

gpu/gpu.gyp

 # Copyright (c) 2009 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.
 
 {
   'variables': {
     'chromium_code': 1,
     # This is defined here because we need to compile this set of files
     # twice with different defines. Once so it calls real GL, again so it
     # calls mock GL for the unit tests.
@@ skipping 232 matching lines @@
         'command_buffer/service/mocks.h',
         'command_buffer/service/precompile.cc',
         'command_buffer/service/precompile.h',
         'command_buffer/service/resource.cc',
         'command_buffer/service/resource.h',
       ],
       'conditions': [
         ['OS == "linux"',
           {
             'sources': [
+              'command_buffer/service/gpu_processor_linux.cc',
               'command_buffer/service/x_utils.cc',
               'command_buffer/service/x_utils.h',
             ],
+            'dependencies': [
+              '../build/linux/system.gyp:gtk',
+            ]
           },
         ],
         ['OS == "win"',
           {
             'sources': [
               'command_buffer/service/gpu_processor_win.cc',
             ],
           },
         ],
       ],
@@ skipping 110 matching lines @@
       },
     ],
   ],
 }
 
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