Update from https://crrev.com/316786

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 497 matching lines @@
                                                           GLenum pname,
                                                           GLint* params);
 static void GL_BINDING_CALL
 Mock_glGetTexParameterfv(GLenum target, GLenum pname, GLfloat* params);
 static void GL_BINDING_CALL
 Mock_glGetTexParameteriv(GLenum target, GLenum pname, GLint* params);
 static void GL_BINDING_CALL Mock_glGetTransformFeedbackVarying(GLuint program,
                                                                GLuint index,
                                                                GLsizei bufSize,
                                                                GLsizei* length,
+                                                               GLsizei* size,
                                                                GLenum* type,
                                                                char* name);
 static void GL_BINDING_CALL
 Mock_glGetTranslatedShaderSourceANGLE(GLuint shader,
                                       GLsizei bufsize,
                                       GLsizei* length,
                                       char* source);
 static GLuint GL_BINDING_CALL
 Mock_glGetUniformBlockIndex(GLuint program, const char* uniformBlockName);
 static void GL_BINDING_CALL
@@ skipping 342 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);