Update from https://crrev.com/316786

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!
 
@@ skipping 372 matching lines @@
                   GLsizei* length,
                   GLint* values));
 MOCK_METHOD4(GetTexLevelParameterfv,
              void(GLenum target, GLint level, GLenum pname, GLfloat* params));
 MOCK_METHOD4(GetTexLevelParameteriv,
              void(GLenum target, GLint level, GLenum pname, GLint* params));
 MOCK_METHOD3(GetTexParameterfv,
              void(GLenum target, GLenum pname, GLfloat* params));
 MOCK_METHOD3(GetTexParameteriv,
              void(GLenum target, GLenum pname, GLint* params));
-MOCK_METHOD6(GetTransformFeedbackVarying,
+MOCK_METHOD7(GetTransformFeedbackVarying,
              void(GLuint program,
                   GLuint index,
                   GLsizei bufSize,
                   GLsizei* length,
+                  GLsizei* size,
                   GLenum* type,
                   char* name));
 MOCK_METHOD4(
     GetTranslatedShaderSourceANGLE,
     void(GLuint shader, GLsizei bufsize, GLsizei* length, char* source));
 MOCK_METHOD2(GetUniformBlockIndex,
              GLuint(GLuint program, const char* uniformBlockName));
 MOCK_METHOD3(GetUniformfv,
              void(GLuint program, GLint location, GLfloat* params));
 MOCK_METHOD4(GetUniformIndices,
@@ skipping 292 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));