split skia.gyp into separate gypfile for each source dir

The single skia.gyp file was getting pretty unwieldy (1600 lines long), so this CL splits it into a separate gypfile for each source directory (analogous to how our makefiles are set up currently).

Ultimately, I think it would be better to maintain each gypfile within the same directory where the source code lives (like we do with the makefiles), but I had some trouble building when I did that... so for this CL, I kept them all in the same directory.  I'll try to move them later.

[bsalomon, 2011-05-29 19:53:31]

On 2011/05/27 22:11:53, epoger wrote:

LGTM

[reed1, 2011-05-31 13:10:01]

LGTM

[epoger, 2011-05-31 13:51:51]

committed as r1446

[Stephen White, 2011-05-31 18:11:01]

On 2011/05/31 13:51:51, epoger wrote:
> committed as r1446

"rm -rf Makefile *mk *.Makefile out
./gyp_skia -fmake --ignore-environment "--toplevel-dir=$PWD" \
  -Icommon.gypi "--depth=$PWD" SampleApp.gyp"

This seems really unfortunate, and overly complex.  Could we instead have a
Makefile that can build all the targets, as Chrome does?

It should just be necessary to run gyp_skia once, and then "Make SampleApp".

[Stephen White, 2011-05-31 18:11:02]

On 2011/05/31 13:51:51, epoger wrote:
> committed as r1446

"rm -rf Makefile *mk *.Makefile out
./gyp_skia -fmake --ignore-environment "--toplevel-dir=$PWD" \
  -Icommon.gypi "--depth=$PWD" SampleApp.gyp"

This seems really unfortunate, and overly complex.  Could we instead have a
Makefile that can build all the targets, as Chrome does?

It should just be necessary to run gyp_skia once, and then "Make SampleApp".

[epoger, 2011-05-31 18:20:45]

On 2011/05/31 18:11:02, Stephen White wrote:
> On 2011/05/31 13:51:51, epoger wrote:
> > committed as r1446
> 
> "rm -rf Makefile *mk *.Makefile out
> ./gyp_skia -fmake --ignore-environment "--toplevel-dir=$PWD" \
>   -Icommon.gypi "--depth=$PWD" SampleApp.gyp"
> 
> This seems really unfortunate, and overly complex.  Could we instead have a
> Makefile that can build all the targets, as Chrome does?
> 
> It should just be necessary to run gyp_skia once, and then "Make SampleApp".

Sure, we can do that.  I'll try to move in that direction.

I should point out that right now I am just *adding* ways to build.  Ultimately
I want to remove all ways of building except for The Right Way (probably gyp,
but yet to be determined).  But for now I am just working on making gyp work for
all targets and platforms.  Once it is working to our liking, we can delete the
prefabricated Makefiles from the repository.

[Stephen White, 2011-05-31 18:28:10]

My point is, this used to work before this change:

./gyp_skia
make SampleApp

Now it doesn't.

[epoger, 2011-05-31 18:29:57]

On 2011/05/31 18:28:10, Stephen White wrote:
> My point is, this used to work before this change:
> 
> ./gyp_skia
> make SampleApp
> 
> Now it doesn't.

That's not good.  I will fix it ASAP.  Sorry for the inconvenience.