gpu: Make pack/unpack alignment part of autogenerated state

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 343 matching lines @@
       },
       {
         'name': 'hint_fragment_shader_derivative',
         'type': 'GLenum',
         'enum': 'GL_FRAGMENT_SHADER_DERIVATIVE_HINT_OES',
         'default': 'GL_DONT_CARE',
         'extension_flag': 'oes_standard_derivatives'
       }
     ],
   },
+  'PixelStore': {
+    'type': 'NamedParameter',
+    'func': 'PixelStorei',
+    'states': [
+      {
+        'name': 'pack_alignment',
+        'type': 'GLint',
+        'enum': 'GL_PACK_ALIGNMENT',
+        'default': '4'
+      },
+      {
+        'name': 'unpack_alignment',
+        'type': 'GLint',
+        'enum': 'GL_UNPACK_ALIGNMENT',
+        'default': '4'
+      }
+    ],
+  },
   # TODO: Consider implemenenting these states
-  # GL_ACTIVE_TEXTURE,
-  # GL_PACK_ALIGNMENT,
-  # GL_UNPACK_ALIGNMENT
+  # GL_ACTIVE_TEXTURE
   'LineWidth': {
     'type': 'Normal',
     'func': 'LineWidth',
     'enum': 'GL_LINE_WIDTH',
     'states': [
       {
         'name': 'line_width',
         'type': 'GLfloat',
         'default': '1.0f',
         'range_checks': [{'check': "<= 0.0f", 'test_value': "0.0f"}],
@@ skipping 6646 matching lines @@
     file.Close()
 
   def WriteContextStateGetters(self, file, class_name):
     """Writes the state getters."""
     for gl_type in ["GLint", "GLfloat"]:
       file.Write("""
 bool %s::GetStateAs%s(
     GLenum pname, %s* params, GLsizei* num_written) const {
   switch (pname) {
 """ % (class_name, gl_type, gl_type))
-      for state_name in _STATES.keys():
+      for state_name in sorted(_STATES.keys()):
         state = _STATES[state_name]
         if 'enum' in state:
           file.Write("    case %s:\n" % state['enum'])
           file.Write("      *num_written = %d;\n" % len(state['states']))
           file.Write("      if (params) {\n")
           for ndx,item in enumerate(state['states']):
             file.Write("        params[%d] = static_cast<%s>(%s);\n" %
                        (ndx, gl_type, item['name']))
           file.Write("      }\n")
           file.Write("      return true;\n")
@@ skipping 723 matching lines @@
     gen.WriteGLES2Header("../GLES2/gl2chromium_autogen.h")
 
   if gen.errors > 0:
     print "%d errors" % gen.errors
     return 1
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv[1:]))