GitLab

This changes the "test" template to create a shared_library (instead of
an executable) on Android. After this, we can actually run
base_unittests with
`build/android/test_runner.py gtest -s base_unnittests`
as normal (though may need to CHROMIUM_OUT_DIR and BUILDTYPE as
appropriate).

This requires adding the following targets:

//testing/android:native_test_native_code
//testing/android:native_test_util
//testing/android:native_test_jni_headers
//tools/android/md5sum:md5sum
//tools/android/md5sum:md5sum_bin
//tools/android/md5sum:md5sum_prepare_dist
//tools/android/md5sum:md5sum_copy_host

Also, makes it so that native executables are stripped (just like shared
libraries). Adds a simple create_native_execuatable_dist template that
sets up a dist directory for the executable (see
build/android/gyp/native_app_dependencies.gyp).

BUG=359249
TBR=rlarocque

Review URL: https://codereview.chromium.org/557463002

Cr-Commit-Position: refs/heads/master@{#294032}