Make gl_bindings_skia_in_process work with OpenGL ES3

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!
 
@@ skipping 476 matching lines @@
                                 GLenum precisiontype,
                                 GLint* range,
                                 GLint* precision);
 static void GL_BINDING_CALL Mock_glGetShaderSource(GLuint shader,
                                                    GLsizei bufsize,
                                                    GLsizei* length,
                                                    char* source);
 static void GL_BINDING_CALL
 Mock_glGetShaderiv(GLuint shader, GLenum pname, GLint* params);
 static const GLubyte* GL_BINDING_CALL Mock_glGetString(GLenum name);
+static const GLubyte* GL_BINDING_CALL
+Mock_glGetStringi(GLenum name, GLuint index);
 static void GL_BINDING_CALL Mock_glGetSynciv(GLsync sync,
                                              GLenum pname,
                                              GLsizei bufSize,
                                              GLsizei* length,
                                              GLint* values);
 static void GL_BINDING_CALL Mock_glGetTexLevelParameterfv(GLenum target,
                                                           GLint level,
                                                           GLenum pname,
                                                           GLfloat* params);
 static void GL_BINDING_CALL Mock_glGetTexLevelParameteriv(GLenum target,
@@ skipping 364 matching lines @@
 static void GL_BINDING_CALL Mock_glVertexAttribPointer(GLuint indx,
                                                        GLint size,
                                                        GLenum type,
                                                        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);