GN: add a helper script for running Android builds

Think of this as the spiritual equivalent of platform_tools/android/bin/android_run_skia, but for GN and easier to type.

Cutting down the debug symbols makes Android builds about 1/4 the size.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2323833002
DOCS_PREVIEW= https://skia.org/user/quick/gn?cl=2323833002

Review-Url: https://codereview.chromium.org/2323833002
3 files changed