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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

Review URL: https://codereview.chromium.org/121173005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@243681 0039d316-1c4b-4281-b951-d872f2087c98