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There aren't many TODO(GYP) remaning and these are the ones I can do
since I don't have a Mac yet.

Tested with the following command line:

$ gn gen --args='os="android" cpu_arch="arm"' out_gn_android/Debug

BUG=None
TEST=see above
R=brettw@chromium.org

Review URL: https://codereview.chromium.org/895443002

Cr-Commit-Position: refs/heads/master@{#314182}