Refactor use of ppapi_cpp and ppapi_tests to avoid include of untrusted.gypi

Refactor use of ppapi_cpp and ppapi_tests to avoid include of untrusted.gypi

Unfortunately a conditional include does not prevent GYP from attempting to load the include file.  It just loads the file and ignores it.

For this reason, a conditional include can not be used to work around a non-existent file.  

Since WebKit doesn't care about anything other than the ppapi_c target, we remove the ppapi_c target from ppapi_cpp.gypi, and put it in it's own file.   

This allows us to remove the include of untrusted.gypi from the ppapi.gyp file.   We do a similar thing to ppapi_internal.gyp.

So instead we put pull in untrusted.gypi into ppapi_cpp and ppapi_tests which are the places where we actually need it.

Since ppapi_cpp and ppapi_tests have become their own gyp files, all references to them also need to be updated.

I am also working on a CL which moves the list of sources into ppapi_sources.gypi as a variable so that we can share the file list in both the trusted and untrusted versions of teh tests and ppapi_cpp library.

So this CL is currently for comparison against that technique which I will upload shortly.

[dmichael (off chromium), 2011-11-22 19:05:23]

I don't quite follow the comment. Is this the solution or a workaround? It kind
of looks like a path towards a solution (refactoring) that didn't work
completely yet (would have required include of untrusted.gypi still), so a
workaround was thrown in too... (removing the include of untrusted.gypi? Is that
what you're saying?

Won't removing untrusted.gypi cause problems for the NaCl versions of the PPAPI
tests which you added?

[dmichael (off chromium), 2011-11-22 19:57:01]

Overall, looks good. Two things:
1) Your try is failing at the patch; you probably need -r HEAD (or other more
recent revision).
2) I admit my gyp fu is weak. But I might have expected an include or dependency
from ppapi_tests.gyp & ppapi_cpp.gyp to untrusted.gypi?

[apatrick_chromium, 2011-11-22 20:06:21]

LGTM for gpu/ stuff.