Add EncodeBackbufferCHROMIUM support to GLES2 command stream

gpu/command_buffer/client/gles2_implementation_impl_autogen.h

 // Copyright (c) 2012 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
 // DO NOT EDIT!
 
 // This file is included by gles2_implementation.cc to define the
 // GL api functions.
@@ skipping 1701 matching lines @@
     }
   });
   if (count < 0) {
     SetGLError(GL_INVALID_VALUE, "glDrawBuffersEXT", "count < 0");
     return;
   }
   helper_->DrawBuffersEXTImmediate(count, bufs);
   CheckGLError();
 }
 
+void GLES2Implementation::EncodeBackbufferCHROMIUM() {
+  GPU_CLIENT_SINGLE_THREAD_CHECK();
+  GPU_CLIENT_LOG("[" << GetLogPrefix() << "] glEncodeBackbufferCHROMIUM(" << ")");  // NOLINT
+  helper_->EncodeBackbufferCHROMIUM();
+  CheckGLError();
+}
+
 #endif  // GPU_COMMAND_BUFFER_CLIENT_GLES2_IMPLEMENTATION_IMPL_AUTOGEN_H_