Merge cronet sample app into Development app

So we have a way to play with the android.net.http APIs.

This is essentially copied from
https://source.chromium.org/chromium/chromium/src/+/main:components/cronet/android/sample/
with minor modifications to support android.net.http APIs (mainly,
renaming APIs and working around the fact that apihelpers are not
available to apps).

Test: adb install -r $OUT/system/app/Development/Development.apk
Change-Id: I8fdb2f64f110551edd39fab074abaf84e76b010f
6 files changed