Add GL_CHROMIUM_screen_space_antialiasing to support alternative AA

gpu/command_buffer/client/gles2_c_lib_autogen.h

 // Copyright 2014 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 is auto-generated from
 // gpu/command_buffer/build_gles2_cmd_buffer.py
 // It's formatted by clang-format using chromium coding style:
 //    clang-format -i -style=chromium filename
 // DO NOT EDIT!
 
@@ skipping 1599 matching lines @@
                                                          GLenum coverMode) {
   gles2::GetGLContext()->StencilThenCoverStrokePathCHROMIUM(path, reference,
                                                             mask, coverMode);
 }
 GLenum GL_APIENTRY GLES2GetGraphicsResetStatusKHR() {
   return gles2::GetGLContext()->GetGraphicsResetStatusKHR();
 }
 void GL_APIENTRY GLES2BlendBarrierKHR() {
   gles2::GetGLContext()->BlendBarrierKHR();
 }
+void GL_APIENTRY GLES2ApplyScreenSpaceAntialiasing() {
+  gles2::GetGLContext()->ApplyScreenSpaceAntialiasing();
+}
 
 namespace gles2 {
 
 extern const NameToFunc g_gles2_function_table[] = {
     {
         "glActiveTexture",
         reinterpret_cast<GLES2FunctionPointer>(glActiveTexture),
     },
     {
         "glAttachShader",
@@ skipping 1226 matching lines @@
     },
     {
         "glGetGraphicsResetStatusKHR",
         reinterpret_cast<GLES2FunctionPointer>(glGetGraphicsResetStatusKHR),
     },
     {
         "glBlendBarrierKHR",
         reinterpret_cast<GLES2FunctionPointer>(glBlendBarrierKHR),
     },
     {
+        "glApplyScreenSpaceAntialiasing",
+        reinterpret_cast<GLES2FunctionPointer>(glApplyScreenSpaceAntialiasing),
+    },
+    {
         NULL, NULL,
     },
 };
 
 }  // namespace gles2
 #endif  // GPU_COMMAND_BUFFER_CLIENT_GLES2_C_LIB_AUTOGEN_H_