[GPU] GLES2 lost context recovery

gpu/command_buffer/common/constants.h

 // 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.
 
 #ifndef GPU_COMMAND_BUFFER_COMMON_CONSTANTS_H_
 #define GPU_COMMAND_BUFFER_COMMON_CONSTANTS_H_
 
 #include "base/basictypes.h"
 
 namespace gpu {
 
 typedef int32 CommandBufferOffset;
 const CommandBufferOffset kInvalidCommandBufferOffset = -1;
 
 // This enum must stay in sync with NPDeviceContext3DError.
 namespace error {
   enum Error {
     kNoError,
     kInvalidSize,
     kOutOfBounds,
     kUnknownCommand,
     kInvalidArguments,
+    kLostContext,
     kGenericError
   };
 }
 
 // Invalid shared memory Id, returned by RegisterSharedMemory in case of
 // failure.
 const int32 kInvalidSharedMemoryId = -1;
 
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_COMMON_CONSTANTS_H_