Teach the native viewport service to draw a Surface into itself

This teaches the native viewport service to accept a surface id from its
client and draw it into the native viewport. This won't work if the
client also tries to bind an onscreen context to the native viewport's
view id, so the surface initialization is lazy and only happens when
the client specifies a surface id. If a client does both it'll blow up.

R=sky@chromium.org

Review URL: https://codereview.chromium.org/510553002

Cr-Commit-Position: refs/heads/master@{#292548}

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