Move constructor and destructor of GLES2CmdHelper out of line

gpu/command_buffer/client/gles2_cmd_helper.cc

 // Copyright (c) 2009 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.
 
 #include "../client/gles2_cmd_helper.h"
 
 namespace gpu {
+namespace gles2 {
 
-// Currently this is a place holder.
+GLES2CmdHelper::GLES2CmdHelper(CommandBuffer* command_buffer)
+    : CommandBufferHelper(command_buffer) {
+}
 
+GLES2CmdHelper::~GLES2CmdHelper() {
+}
+
+}  // namespace gles2
 }  // namespace gpu