Add GL_EXT_multisampled_render_to_texture support to command buffer.

gpu/command_buffer/client/gles2_cmd_helper_autogen.h

Index: gpu/command_buffer/client/gles2_cmd_helper_autogen.h
diff --git a/gpu/command_buffer/client/gles2_cmd_helper_autogen.h b/gpu/command_buffer/client/gles2_cmd_helper_autogen.h
index 9c2898e8c65171754dd7a92bff0cdc112e6f3c1e..8d2fd7d5ef426cd3c6e99f180fda7bee88d52152 100644
--- a/gpu/command_buffer/client/gles2_cmd_helper_autogen.h
+++ b/gpu/command_buffer/client/gles2_cmd_helper_autogen.h
@@ -1577,6 +1577,16 @@
     }
   }
 
+  void FramebufferTexture2DMultisampleEXT(
+      GLenum target, GLenum attachment, GLenum textarget, GLuint texture,
+      GLint level, GLsizei samples) {
+    gles2::cmds::FramebufferTexture2DMultisampleEXT* c =
+        GetCmdSpace<gles2::cmds::FramebufferTexture2DMultisampleEXT>();
+    if (c) {
+      c->Init(target, attachment, textarget, texture, level, samples);
+    }
+  }
+
   void TexStorage2DEXT(
       GLenum target, GLsizei levels, GLenum internalFormat, GLsizei width,
       GLsizei height) {