media: scaffolding and plumbing for MojoRenderer{Impl, Service}

media: scaffolding and plumbing for MojoRenderer{Impl, Service}

* Add skeleton client-side and service-side MediaRenderer pieces with basic plumbing and connections but no real logic.
* model a media::DemuxerStream in a mojom to clean up MediaRenderer interface and line-up with RendererImpl expectations.
* add DecoderConfig plumbing support
* add a basic unittest verifying things do actually hook up
* consolidate around 'media_mojo_' naming in media.gyp and add media_mojo target to build all this stuff.

BUG=410451

[xhwang, 2014-09-02 17:05:53]

some preliminary comments I had when I looked at this CL...

https://codereview.chromium.org/518163003/diff/40001/media/mojo/services/mojo...
File media/mojo/services/mojo_renderer_client_impl.h (right):

https://codereview.chromium.org/518163003/diff/40001/media/mojo/services/mojo...
media/mojo/services/mojo_renderer_client_impl.h:16: class MojoRendererClientImpl
: public Renderer,
From media pipeline's perspective, this is a mojo based Renderer implementation.
The fact that it's also a mojo::MediaRendererClient (hence the "Client") is an
implementation detail. How about s/MojoRendererClientImpl/MojoRendererImpl?

https://codereview.chromium.org/518163003/diff/40001/media/mojo/services/mojo...
media/mojo/services/mojo_renderer_client_impl.h:22: mojo::ServiceProvider*
media_renderer_provider);
This can also take a DemuxerStreamProvider* demuxer_stream_provider in the
future.

See https://codereview.chromium.org/523283002/

[tim (not reviewing), 2014-09-02 18:20:05]

https://codereview.chromium.org/518163003/diff/40001/media/mojo/services/mojo...
File media/mojo/services/mojo_renderer_client_impl.h (right):

https://codereview.chromium.org/518163003/diff/40001/media/mojo/services/mojo...
media/mojo/services/mojo_renderer_client_impl.h:16: class MojoRendererClientImpl
: public Renderer,
On 2014/09/02 17:05:52, xhwang wrote:
> From media pipeline's perspective, this is a mojo based Renderer
implementation.
> The fact that it's also a mojo::MediaRendererClient (hence the "Client") is an
> implementation detail. How about s/MojoRendererClientImpl/MojoRendererImpl?

Yeah, I had it named that way before... I think the reason I changed it is
because the "mojo based renderer implementation" is actually two-fold: it has a
client and a service.  Although I didn't make this really obvious as the two
names aren't symmetric.  What about if we had 

MojoRendererClientImpl / MojoRendererServiceImpl
or
MojoRendererImplClient / MojoRendererImplService

?

https://codereview.chromium.org/518163003/diff/40001/media/mojo/services/mojo...
media/mojo/services/mojo_renderer_client_impl.h:22: mojo::ServiceProvider*
media_renderer_provider);
On 2014/09/02 17:05:53, xhwang wrote:
> This can also take a DemuxerStreamProvider* demuxer_stream_provider in the
> future.
> 
> See https://codereview.chromium.org/523283002/

cool!

[tim (not reviewing), 2014-09-06 01:38:51]

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