Call xglMakeCurrent for each command buffer to allow for multiple GL contexts...

gpu/command_buffer/service/gles2_cmd_decoder.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.
 
 // This file contains the GLES2Decoder class.
 
 #ifndef GPU_COMMAND_BUFFER_SERVICE_GLES2_CMD_DECODER_H_
 #define GPU_COMMAND_BUFFER_SERVICE_GLES2_CMD_DECODER_H_
 
 #include <build/build_config.h>
@@ skipping 47 matching lines @@
 #endif
 
   // Initializes the graphics context.
   // Returns:
   //   true if successful.
   virtual bool Initialize() = 0;
 
   // Destroys the graphics context.
   virtual void Destroy() = 0;
 
+  // Make this decoder's GL context current.
+  virtual bool MakeCurrent() = 0;
+
   // Gets a service id by client id.
   virtual uint32 GetServiceIdForTesting(uint32 client_id) = 0;
 
  protected:
   GLES2Decoder();
 
  private:
   bool debug_;
 
 #if defined(OS_LINUX)
   XWindowWrapper *window_;
 #elif defined(OS_WIN)
   // Handle to the GL device.
   HWND hwnd_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(GLES2Decoder);
 };
 
 }  // namespace gles2
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_GLES2_CMD_DECODER_H_