Linux: use generated shim headers for system mesa.

gpu/command_buffer/build_gles2_cmd_buffer.py

 #!/usr/bin/env python
 # 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.
 
 """code generator for GLES2 command buffers."""
 
 import itertools
 import os
 import os.path
@@ skipping 2301 matching lines @@
   },
 }
 
 
 _CHROMIUM_SPECIFIC_CONSTANTS = {
   'GL_CONTEXT_LOST': '0x300E',  # TODO(gman): What value?
 }
 
 
 _CHROMIUM_SPECIFIC_EXTENSIONS = {
+  # TODO(phajdan.jr): Remove this after fixing upstream khronos header
+  # for extension below (it misses e.g. #define GL_ANGLE_instanced_arrays 1
+  # after #ifndef check, which confuses generate_bindings.py).
+  'GL_ANGLE_instanced_arrays': {
+    'functions': [
+      'DrawArraysInstancedANGLE',
+      'DrawElementsInstancedANGLE',
+      'VertexAttribDivisorANGLE',
+    ],
+  },
   'GL_EXT_framebuffer_multisample': {
     'constants': {
       'GL_DRAW_FRAMEBUFFER_BINDING': '0x8CA6',
       'GL_DRAW_FRAMEBUFFER_BINDING_EXT': 'GL_DRAW_FRAMEBUFFER_BINDING',
       'GL_FRAMEBUFFER_BINDING': '0x8CA6',
       'GL_FRAMEBUFFER_BINDING_EXT': 'GL_FRAMEBUFFER_BINDING',
       'GL_RENDERBUFFER_BINDING': '0x8CA7',
       'GL_RENDERBUFFER_BINDING_EXT': 'GL_RENDERBUFFER_BINDING',
       'GL_READ_FRAMEBUFFER': '0x8CA8',
       'GL_READ_FRAMEBUFFER_EXT': 'GL_READ_FRAMEBUFFER',
@@ skipping 5504 matching lines @@
     gen.WriteGLES2ExtHeader("../GLES2/gl2extchromium.h")
 
   if gen.errors > 0:
     print "%d errors" % gen.errors
     return 1
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv[1:]))