Add CopyTexSubImage3D to GPU command buffer.

gpu/command_buffer/client/gles2_interface_stub_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 94 matching lines @@
                     GLsizei height,
                     GLint border) override;
 void CopyTexSubImage2D(GLenum target,
                        GLint level,
                        GLint xoffset,
                        GLint yoffset,
                        GLint x,
                        GLint y,
                        GLsizei width,
                        GLsizei height) override;
+void CopyTexSubImage3D(GLenum target,
+                       GLint level,
+                       GLint xoffset,
+                       GLint yoffset,
+                       GLint zoffset,
+                       GLint x,
+                       GLint y,
+                       GLsizei width,
+                       GLsizei height) override;
 GLuint CreateProgram() override;
 GLuint CreateShader(GLenum type) override;
 void CullFace(GLenum mode) override;
 void DeleteBuffers(GLsizei n, const GLuint* buffers) override;
 void DeleteFramebuffers(GLsizei n, const GLuint* framebuffers) override;
 void DeleteProgram(GLuint program) override;
 void DeleteRenderbuffers(GLsizei n, const GLuint* renderbuffers) override;
 void DeleteSamplers(GLsizei n, const GLuint* samplers) override;
 void DeleteSync(GLsync sync) override;
 void DeleteShader(GLuint shader) override;
@@ skipping 514 matching lines @@
                                   GLint bounds_height,
                                   GLfloat uv_x,
                                   GLfloat uv_y,
                                   GLfloat uv_width,
                                   GLfloat uv_height) override;
 void SwapInterval(GLint interval) override;
 void MatrixLoadfCHROMIUM(GLenum matrixMode, const GLfloat* m) override;
 void MatrixLoadIdentityCHROMIUM(GLenum matrixMode) override;
 void BlendBarrierKHR() override;
 #endif  // GPU_COMMAND_BUFFER_CLIENT_GLES2_INTERFACE_STUB_AUTOGEN_H_