Add GL_CHROMIUM_screen_space_antialiasing to support alternative AA

ui/gl/gl_bindings_autogen_mock.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!
 
 static void GL_BINDING_CALL Mock_glActiveTexture(GLenum texture);
+static void GL_BINDING_CALL Mock_glApplyFramebufferAttachmentCMAAINTEL(void);
 static void GL_BINDING_CALL Mock_glAttachShader(GLuint program, GLuint shader);
 static void GL_BINDING_CALL Mock_glBeginQuery(GLenum target, GLuint id);
 static void GL_BINDING_CALL Mock_glBeginQueryARB(GLenum target, GLuint id);
 static void GL_BINDING_CALL Mock_glBeginQueryEXT(GLenum target, GLuint id);
 static void GL_BINDING_CALL Mock_glBeginTransformFeedback(GLenum primitiveMode);
 static void GL_BINDING_CALL Mock_glBindAttribLocation(GLuint program,
                                                       GLuint index,
                                                       const char* name);
 static void GL_BINDING_CALL Mock_glBindBuffer(GLenum target, GLuint buffer);
 static void GL_BINDING_CALL Mock_glBindBufferBase(GLenum target,
@@ skipping 1000 matching lines @@
                                                        GLboolean normalized,
                                                        GLsizei stride,
                                                        const void* ptr);
 static void GL_BINDING_CALL Mock_glViewport(GLint x,
                                             GLint y,
                                             GLsizei width,
                                             GLsizei height);
 static GLenum GL_BINDING_CALL Mock_glWaitSync(GLsync sync,
                                               GLbitfield flags,
                                               GLuint64 timeout);