Update from https://crrev.com/316786

ui/gl/gl_bindings_autogen_mock.cc

 // 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 1427 matching lines @@
                                                                GLint* params) {
   MakeFunctionUnique("glGetTexParameteriv");
   interface_->GetTexParameteriv(target, pname, params);
 }
 
 void GL_BINDING_CALL
 MockGLInterface::Mock_glGetTransformFeedbackVarying(GLuint program,
                                                     GLuint index,
                                                     GLsizei bufSize,
                                                     GLsizei* length,
+                                                    GLsizei* size,
                                                     GLenum* type,
                                                     char* name) {
   MakeFunctionUnique("glGetTransformFeedbackVarying");
-  interface_->GetTransformFeedbackVarying(program, index, bufSize, length, type,
-                                          name);
+  interface_->GetTransformFeedbackVarying(program, index, bufSize, length, size,
+                                          type, name);
 }
 
 void GL_BINDING_CALL
 MockGLInterface::Mock_glGetTranslatedShaderSourceANGLE(GLuint shader,
                                                        GLsizei bufsize,
                                                        GLsizei* length,
                                                        char* source) {
   MakeFunctionUnique("glGetTranslatedShaderSourceANGLE");
   interface_->GetTranslatedShaderSourceANGLE(shader, bufsize, length, source);
 }
@@ skipping 1747 matching lines @@
   if (strcmp(name, "glVertexAttribPointer") == 0)
     return reinterpret_cast<void*>(Mock_glVertexAttribPointer);
   if (strcmp(name, "glViewport") == 0)
     return reinterpret_cast<void*>(Mock_glViewport);
   if (strcmp(name, "glWaitSync") == 0)
     return reinterpret_cast<void*>(Mock_glWaitSync);
   return reinterpret_cast<void*>(&MockInvalidFunction);
 }
 
 }  // namespace gfx