Add GL_EXT_multisampled_render_to_texture support to command buffer.

gpu/command_buffer/service/framebuffer_manager.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.
 
 #ifndef GPU_COMMAND_BUFFER_SERVICE_FRAMEBUFFER_MANAGER_H_
 #define GPU_COMMAND_BUFFER_SERVICE_FRAMEBUFFER_MANAGER_H_
 
 #include "base/basictypes.h"
 #include "base/containers/hash_tables.h"
 #include "base/memory/ref_counted.h"
@@ skipping 56 matching lines @@
     bool cleared);
 
   // Attaches a renderbuffer to a particlar attachment.
   // Pass null to detach.
   void AttachRenderbuffer(
       GLenum attachment, Renderbuffer* renderbuffer);
 
   // Attaches a texture to a particlar attachment. Pass null to detach.
   void AttachTexture(
       GLenum attachment, TextureRef* texture_ref, GLenum target,
-      GLint level);
+      GLint level, GLsizei samples);
 
   // Unbinds the given renderbuffer if it is bound.
   void UnbindRenderbuffer(
       GLenum target, Renderbuffer* renderbuffer);
 
   // Unbinds the given texture if it is bound.
   void UnbindTexture(
       GLenum target, TextureRef* texture_ref);
 
   const Attachment* GetAttachment(GLenum attachment) const;
@@ skipping 153 matching lines @@
   uint32 max_draw_buffers_;
   uint32 max_color_attachments_;
 
   DISALLOW_COPY_AND_ASSIGN(FramebufferManager);
 };
 
 }  // namespace gles2
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_FRAMEBUFFER_MANAGER_H_