Add GL_CHROMIUM_screen_space_antialiasing to support alternative AA

ui/gl/gl_mock_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!
 
 MOCK_METHOD1(ActiveTexture, void(GLenum texture));
+MOCK_METHOD0(ApplyFramebufferAttachmentCMAAINTEL, void());
 MOCK_METHOD2(AttachShader, void(GLuint program, GLuint shader));
 MOCK_METHOD2(BeginQuery, void(GLenum target, GLuint id));
 MOCK_METHOD1(BeginTransformFeedback, void(GLenum primitiveMode));
 MOCK_METHOD3(BindAttribLocation,
              void(GLuint program, GLuint index, const char* name));
 MOCK_METHOD2(BindBuffer, void(GLenum target, GLuint buffer));
 MOCK_METHOD3(BindBufferBase, void(GLenum target, GLuint index, GLuint buffer));
 MOCK_METHOD5(BindBufferRange,
              void(GLenum target,
                   GLuint index,
@@ skipping 702 matching lines @@
                   const void* ptr));
 MOCK_METHOD6(VertexAttribPointer,
              void(GLuint indx,
                   GLint size,
                   GLenum type,
                   GLboolean normalized,
                   GLsizei stride,
                   const void* ptr));
 MOCK_METHOD4(Viewport, void(GLint x, GLint y, GLsizei width, GLsizei height));
 MOCK_METHOD3(WaitSync, GLenum(GLsync sync, GLbitfield flags, GLuint64 timeout));