Add support for GL_CHROMIUM_pixel_transfer_buffer_object.

gpu/command_buffer/service/gl_utils.h

 // 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.
 
 // This file includes all the necessary GL headers and implements some useful
 // utilities.
 
 #ifndef GPU_COMMAND_BUFFER_SERVICE_GL_UTILS_H_
 #define GPU_COMMAND_BUFFER_SERVICE_GL_UTILS_H_
 
@@ skipping 92 matching lines @@
 
 // GL_OES_packed_depth_stencil
 #define GL_DEPTH24_STENCIL8_OES                0x88F0
 
 // GL_OES_compressed_ETC1_RGB8_texture
 #define GL_ETC1_RGB8_OES                       0x8D64
 
 // GL_OES_vertex_array_object
 #define GL_VERTEX_ARRAY_BINDING_OES            0x85B5
 
+// GL_CHROMIUM_pixel_transfer_buffer_object
+#define GL_PIXEL_UNPACK_TRANSFER_BUFFER_CHROMIUM 0x78EC
+#define GL_PIXEL_UNPACK_TRANSFER_BUFFER_BINDING_CHROMIUM 0x78EF
+
 #define GL_GLEXT_PROTOTYPES 1
 
 // GL_ARB_get_program_binary
 #define PROGRAM_BINARY_RETRIEVABLE_HINT        0x8257
 // GL_OES_get_program_binary
 #define GL_PROGRAM_BINARY_LENGTH_OES           0x8741
 #define GL_NUM_PROGRAM_BINARY_FORMATS_OES      0x87FE
 #define GL_PROGRAM_BINARY_FORMATS_OES          0x87FF
 
 // Define this for extra GL error debugging (slower).
 // #define GL_ERROR_DEBUGGING
 #ifdef GL_ERROR_DEBUGGING
 #define CHECK_GL_ERROR() do {                                           \
     GLenum gl_error = glGetError();                                     \
     LOG_IF(ERROR, gl_error != GL_NO_ERROR) << "GL Error :" << gl_error; \
   } while (0)
 #else  // GL_ERROR_DEBUGGING
 #define CHECK_GL_ERROR() void(0)
 #endif  // GL_ERROR_DEBUGGING
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_GL_UTILS_H_