Add GL_EXT_multisampled_render_to_texture support to command buffer.

gpu/command_buffer/client/gles2_interface_autogen.h

Index: gpu/command_buffer/client/gles2_interface_autogen.h
diff --git a/gpu/command_buffer/client/gles2_interface_autogen.h b/gpu/command_buffer/client/gles2_interface_autogen.h
index 78c50022e601c7963a29a91e355dd470733d6208..24ce83bc2f5f714eae7d660dcc041bf306342550 100644
--- a/gpu/command_buffer/client/gles2_interface_autogen.h
+++ b/gpu/command_buffer/client/gles2_interface_autogen.h
@@ -223,6 +223,9 @@ virtual void BlitFramebufferEXT(
 virtual void RenderbufferStorageMultisampleEXT(
     GLenum target, GLsizei samples, GLenum internalformat, GLsizei width,
     GLsizei height) = 0;
+virtual void FramebufferTexture2DMultisampleEXT(
+    GLenum target, GLenum attachment, GLenum textarget, GLuint texture,
+    GLint level, GLsizei samples) = 0;
 virtual void TexStorage2DEXT(
     GLenum target, GLsizei levels, GLenum internalFormat, GLsizei width,
     GLsizei height) = 0;