linux: dynamically load libGL.so.1, and use glew to dynamically resolve symbols

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 36 matching lines @@
         [ 'OS=="linux"',
           {
             'all_dependent_settings': {
               'defines': [
                 'GL_GLEXT_PROTOTYPES',
               ],
               'ldflags': [
                 '-L<(PRODUCT_DIR)',
               ],
               'libraries': [
-                '-lGL',
                 '-lX11',
               ],
             },
           },
         ],
         [ 'OS=="mac"',
           {
             'direct_dependent_settings': {
               'libraries': [
                 '$(SDKROOT)/System/Library/Frameworks/OpenGL.framework',
@@ skipping 180 matching lines @@
       ],
       'conditions': [
         ['OS == "linux"',
           {
             'sources': [
               'command_buffer/service/gpu_processor_linux.cc',
               'command_buffer/service/x_utils.cc',
               'command_buffer/service/x_utils.h',
             ],
             'dependencies': [
+              'gl_libs',
               '../build/linux/system.gyp:gtk',
             ]
           },
         ],
         ['OS == "win"',
           {
             'sources': [
               'command_buffer/service/gpu_processor_win.cc',
             ],
           },
@@ skipping 113 matching lines @@
       },
     ],
   ],
 }
 
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