Add a command to lose the context

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 1675 matching lines @@
   GPU_CLIENT_LOG_CODE_BLOCK({
     for (GLsizei i = 0; i < count; ++i) {
        GPU_CLIENT_LOG("  " << i << ": " << attachments[0 + i * 1]);
     }
   });
   if (count < 0) {
     SetGLError(GL_INVALID_VALUE, "glDiscardFramebufferEXT", "count < 0");
     return;
   }
   helper_->DiscardFramebufferEXTImmediate(target, count, attachments);
+  CheckGLError();
+}
+
+void GLES2Implementation::LoseContextCHROMIUM() {
+  GPU_CLIENT_SINGLE_THREAD_CHECK();
+  GPU_CLIENT_LOG("[" << GetLogPrefix() << "] glLoseContextCHROMIUM(" << ")");
+  helper_->LoseContextCHROMIUM();
+  CheckGLError();
 }
 
 #endif  // GPU_COMMAND_BUFFER_CLIENT_GLES2_IMPLEMENTATION_IMPL_AUTOGEN_H_