GN(android): Add scripts & runtime logic for installing _incremental apks

Currently only .so files are side-loaded (no .dex side-loading yet).
Does not require a rooted device.

Usage:

    ninja -C out/Debug chrome_apk_incremental
    out/Debug/bin/install_incremental_chrome_app_apk

BUG=520082

Review URL: https://codereview.chromium.org/1291793007

Cr-Commit-Position: refs/heads/master@{#346583}


CrOS-Libchrome-Original-Commit: ae65db8da9a27bea569869f4b5a86de4b4857260
6 files changed
tree: d5b9215aa34fc84635294b63b523598232698551
  1. base/
  2. build/
  3. components/
  4. dbus/
  5. device/
  6. ipc/
  7. mojo/
  8. testing/
  9. third_party/
  10. ui/