Convert media.gyp on Linux.

Converts most logic in media.gyp to BUILD.gn files.

Most everything but android and cdm code has been converted. Next step is to break these up into smaller BUILD.gn files per subdirectory.

All hail GN. orz

BUG=none
R=brettw@chromium.org, dalecurtis@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=282448

[awong, 2014-05-01 21:58:26]

@brettw: GN style sanity check...and also to show the insanity coming down the
pipe.

@dalecurtis: FYI.

[brettw, 2014-05-05 19:38:02]

high level lgtm

https://codereview.chromium.org/268713006/diff/1/media/BUILD.gn
File media/BUILD.gn (right):

https://codereview.chromium.org/268713006/diff/1/media/BUILD.gn#newcode31
media/BUILD.gn:31: # TODO(ajwong): These variables need set appropriately.
Which variables?

[awong, 2014-05-05 20:47:47]

https://codereview.chromium.org/268713006/diff/1/media/BUILD.gn
File media/BUILD.gn (right):

https://codereview.chromium.org/268713006/diff/1/media/BUILD.gn#newcode31
media/BUILD.gn:31: # TODO(ajwong): These variables need set appropriately.
On 2014/05/05 19:38:03, brettw wrote:
> Which variables?

Uploaded much newer version of CL. Comment is now gone.

[DaleCurtis, 2014-05-05 21:46:29]

rslgtm

[awong, 2014-05-05 21:47:13]

On 2014/05/05 21:46:29, DaleCurtis wrote:
> rslgtm

rs?

[DaleCurtis, 2014-05-05 21:50:40]

RubberStamp, though I did look through this, I just don't understand most of it
:)

[awong, 2014-07-08 02:49:38]

On 2014/05/05 21:50:40, DaleCurtis_OOO_Jul1-8 wrote:
> RubberStamp, though I did look through this, I just don't understand most of
it
> :)

I'm totally getting mideval on this CL and redoing it. It's going to be so much
more complex...you'll love it dale.

[awong, 2014-07-10 22:53:33]

On 2014/07/08 02:49:38, awong wrote:
> On 2014/05/05 21:50:40, DaleCurtis_OOO_Jul1-8 wrote:
> > RubberStamp, though I did look through this, I just don't understand most of
> it
> > :)
> 
> I'm totally getting mideval on this CL and redoing it. It's going to be so
much
> more complex...you'll love it dale.

Submitting new version w/o any connection to the build system so Dale can help
hack.

[awong, 2014-07-10 22:54:46]

Committed patchset #3 manually as r282448 (presubmit successful).