Add a second unsafe ES3 API in command buffer.

gpu/command_buffer/client/gles2_trace_implementation_impl_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 149 matching lines @@
                                                        GLsizei width,
                                                        GLsizei height,
                                                        GLenum format,
                                                        GLsizei imageSize,
                                                        const void* data) {
   TRACE_EVENT_BINARY_EFFICIENT0("gpu", "GLES2Trace::CompressedTexSubImage2D");
   gl_->CompressedTexSubImage2D(target, level, xoffset, yoffset, width, height,
                                format, imageSize, data);
 }
 
+void GLES2TraceImplementation::CopyBufferSubData(GLenum readtarget,
+                                                 GLenum writetarget,
+                                                 GLintptr readoffset,
+                                                 GLintptr writeoffset,
+                                                 GLsizeiptr size) {
+  TRACE_EVENT_BINARY_EFFICIENT0("gpu", "GLES2Trace::CopyBufferSubData");
+  gl_->CopyBufferSubData(readtarget, writetarget, readoffset, writeoffset,
+                         size);
+}
+
 void GLES2TraceImplementation::CopyTexImage2D(GLenum target,
                                               GLint level,
                                               GLenum internalformat,
                                               GLint x,
                                               GLint y,
                                               GLsizei width,
                                               GLsizei height,
                                               GLint border) {
   TRACE_EVENT_BINARY_EFFICIENT0("gpu", "GLES2Trace::CopyTexImage2D");
   gl_->CopyTexImage2D(target, level, internalformat, x, y, width, height,
@@ skipping 1351 matching lines @@
                                 "GLES2Trace::MatrixLoadIdentityCHROMIUM");
   gl_->MatrixLoadIdentityCHROMIUM(matrixMode);
 }
 
 void GLES2TraceImplementation::BlendBarrierKHR() {
   TRACE_EVENT_BINARY_EFFICIENT0("gpu", "GLES2Trace::BlendBarrierKHR");
   gl_->BlendBarrierKHR();
 }
 
 #endif  // GPU_COMMAND_BUFFER_CLIENT_GLES2_TRACE_IMPLEMENTATION_IMPL_AUTOGEN_H_