Work on Android GN build.

Work on Android GN build.

Adds arm version and some android configuration build flags.

This adds most of the logic from common.gypi to the Android GN build.

This is currently missing the crtbegin/end stuff and won't actually make real Android builds. The logic in this patch is just the initial conversion that will require testing and several more passes of fixes.

R=torne@chromium.org, torne

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=243681

[Torne, 2014-01-03 16:14:37]

I haven't looked at this in detail yet, but a question about crtbegin/end.. when
you say this isn't there yet what is the actual effect of this being missing?
Does it mean we can't build shared libraries/executables for Android with gn? Or
something else?

[brettw, 2014-01-03 18:39:46]

On 2014/01/03 16:14:37, Torne wrote:
> I haven't looked at this in detail yet, but a question about crtbegin/end..
when
> you say this isn't there yet what is the actual effect of this being missing?
> Does it mean we can't build shared libraries/executables for Android with gn?
Or
> something else?

Yes, currently I'm just trying to build a static library and I don't think it
matters.

If it's OK, I'd like to check this in so I can start sending tries for my target
to the bot and see what happens. We can follow-up with any changes you can think
of.

[Torne, 2014-01-06 16:13:13]

Still haven't had a chance to look at this in detail, but +cjhopman who I think
still looks after most of the main android build stuff (i.e. not-webview).

If you want to land it to make progress with the conversion and fix up problems
later, though, then LGTM for that :)

[brettw, 2014-01-08 22:47:49]

Committed patchset #11 manually as r243681 (presubmit successful).