Create an image from backend texture handle

[THEREALWWEFAN231]

I think I'd be cool if you could create an Image from a texture already on the GPU. For example I'm using opengl and do some native rendering to a frame buffer and would like to pass the frame buffers texture id to skia to render it on a canvas and do some effects with it, or even better yet just create an Image from a framebuffer id.

[tonsky]

You should ask for it in Skia google group I think