Add glTransformFeedbackVaryings to GPU command buffer.

gpu/command_buffer/client/gles2_interface_autogen.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
 // gpu/command_buffer/build_gles2_cmd_buffer.py
 // It's formatted by clang-format using chromium coding style:
 //    clang-format -i -style=chromium filename
 // DO NOT EDIT!
 
@@ skipping 346 matching lines @@
                            GLint level,
                            GLint xoffset,
                            GLint yoffset,
                            GLint zoffset,
                            GLsizei width,
                            GLsizei height,
                            GLsizei depth,
                            GLenum format,
                            GLenum type,
                            const void* pixels) = 0;
+virtual void TransformFeedbackVaryings(GLuint program,
+                                       GLsizei count,
+                                       const char* const* varyings,
+                                       GLenum buffermode) = 0;
 virtual void Uniform1f(GLint location, GLfloat x) = 0;
 virtual void Uniform1fv(GLint location, GLsizei count, const GLfloat* v) = 0;
 virtual void Uniform1i(GLint location, GLint x) = 0;
 virtual void Uniform1iv(GLint location, GLsizei count, const GLint* v) = 0;
 virtual void Uniform1ui(GLint location, GLuint x) = 0;
 virtual void Uniform1uiv(GLint location, GLsizei count, const GLuint* v) = 0;
 virtual void Uniform2f(GLint location, GLfloat x, GLfloat y) = 0;
 virtual void Uniform2fv(GLint location, GLsizei count, const GLfloat* v) = 0;
 virtual void Uniform2i(GLint location, GLint x, GLint y) = 0;
 virtual void Uniform2iv(GLint location, GLsizei count, const GLint* v) = 0;
@@ skipping 275 matching lines @@
                                           GLint bounds_height,
                                           GLfloat uv_x,
                                           GLfloat uv_y,
                                           GLfloat uv_width,
                                           GLfloat uv_height) = 0;
 virtual void SwapInterval(GLint interval) = 0;
 virtual void MatrixLoadfCHROMIUM(GLenum matrixMode, const GLfloat* m) = 0;
 virtual void MatrixLoadIdentityCHROMIUM(GLenum matrixMode) = 0;
 virtual void BlendBarrierKHR() = 0;
 #endif  // GPU_COMMAND_BUFFER_CLIENT_GLES2_INTERFACE_AUTOGEN_H_