Add in missing file from previous CL

gpu/gpu.gyp

Index: gpu/gpu.gyp
===================================================================
--- gpu/gpu.gyp	(revision 34647)
+++ gpu/gpu.gyp	(working copy)
@@ -175,6 +175,7 @@
           'command_buffer/common/gles2_cmd_format_test.cc',
           'command_buffer/common/gles2_cmd_format_test_autogen.h',
           'command_buffer/common/gles2_cmd_id_test.cc',
+          'command_buffer/common/gles2_cmd_id_test_autogen.h',
         ],
       },
     },
@@ -228,9 +229,12 @@
         'command_buffer/service/cmd_parser.cc',
         'command_buffer/service/cmd_parser.h',
         'command_buffer/service/gles2_cmd_decoder.h',
-        'command_buffer/service/gles2_cmd_decoder_validate.h',
         'command_buffer/service/gles2_cmd_decoder_autogen.h',
         'command_buffer/service/gles2_cmd_decoder.cc',
+        'command_buffer/service/gles2_cmd_validation.h',
+        'command_buffer/service/gles2_cmd_validation.cc',
+        'command_buffer/service/gles2_cmd_validation_autogen.h',
+        'command_buffer/service/gles2_cmd_validation_implementation_autogen.h',
         'command_buffer/service/gl_utils.h',
         'command_buffer/service/gpu_processor.h',
         'command_buffer/service/gpu_processor.cc',