Implementing basic render pass through graphics API

Implementing basic render pass through graphics API

Rather than relying on test code in PresentRenderTarget, this instead
sets up basic command buffers properly, and expects Begin,
BeginRenderPass, EndRenderPass, End commands,
Controller::SubmitCommandBuffers and ::PresentRenderTarget to work in
the right way.

Suggested test code is to create an empty app with a single
actor/renderer pair that has a RenderCallback attached.

Change-Id: I828f37aa704bacd18487d9c0a516051b91f6e5fd