Mark SwapBuffers for an offscreen surface as unimplemented

gpu/command_buffer/service/gles2_cmd_decoder_passthrough.h

 // Copyright (c) 2016 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 contains the GLES2DecoderPassthroughImpl class.
 
 #ifndef GPU_COMMAND_BUFFER_SERVICE_GLES2_CMD_DECODER_PASSTHROUGH_H_
 #define GPU_COMMAND_BUFFER_SERVICE_GLES2_CMD_DECODER_PASSTHROUGH_H_
 
 #include "base/memory/ref_counted.h"
@@ skipping 298 matching lines @@
     uint8_t cmd_flags;   // How to handle this command
     uint16_t arg_count;  // How many arguments are expected for this command.
   };
 
   // A table of CommandInfo for all the commands.
   static const CommandInfo command_info[kNumCommands - kFirstGLES2Command];
 
   // The GL context this decoder renders to on behalf of the client.
   scoped_refptr<gl::GLSurface> surface_;
   scoped_refptr<gl::GLContext> context_;
+  bool offscreen_;
 
   // Managers
   std::unique_ptr<ImageManager> image_manager_;
 
   // The ContextGroup for this decoder uses to track resources.
   scoped_refptr<ContextGroup> group_;
   scoped_refptr<FeatureInfo> feature_info_;
 
   // Callbacks
   FenceSyncReleaseCallback fence_sync_release_callback_;
@@ skipping 52 matching lines @@
 
 // Include the prototypes of all the doer functions from a separate header to
 // keep this file clean.
 #include "gpu/command_buffer/service/gles2_cmd_decoder_passthrough_doer_prototypes.h"
 };
 
 }  // namespace gles2
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_GLES2_CMD_DECODER_PASSTHROUGH_H_