Add GL_CHROMIUM_screen_space_antialiasing to support alternative AA

ui/gl/gl_bindings_api_autogen_gl.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
 // ui/gl/generate_bindings.py
 // It's formatted by clang-format using chromium coding style:
 //    clang-format -i -style=chromium filename
 // DO NOT EDIT!
 
 void glActiveTextureFn(GLenum texture) override;
+void glApplyFramebufferAttachmentCMAAINTELFn(void) override;
 void glAttachShaderFn(GLuint program, GLuint shader) override;
 void glBeginQueryFn(GLenum target, GLuint id) override;
 void glBeginTransformFeedbackFn(GLenum primitiveMode) override;
 void glBindAttribLocationFn(GLuint program,
                             GLuint index,
                             const char* name) override;
 void glBindBufferFn(GLenum target, GLuint buffer) override;
 void glBindBufferBaseFn(GLenum target, GLuint index, GLuint buffer) override;
 void glBindBufferRangeFn(GLenum target,
                          GLuint index,
@@ skipping 718 matching lines @@
                               GLsizei stride,
                               const void* ptr) override;
 void glVertexAttribPointerFn(GLuint indx,
                              GLint size,
                              GLenum type,
                              GLboolean normalized,
                              GLsizei stride,
                              const void* ptr) override;
 void glViewportFn(GLint x, GLint y, GLsizei width, GLsizei height) override;
 GLenum glWaitSyncFn(GLsync sync, GLbitfield flags, GLuint64 timeout) override;