1) com.skia -> com.skia.sample_app
2) pass arguments to android_gdb_app to android_setup.sh so you can build gdbserver binaries for your actual device(rather than default arm64). This allows you to run it like this for example:
./platform_tools/android/bin/android_gdb_app -d nexus_6
BUG=skia:
DOCS_PREVIEW= https://skia.org/?cl=1509853006
Review URL: https://codereview.chromium.org/1509853006
Rename a few files to make their function clearer.
Update other files to remove dead code or improve function.
Review URL: https://codereview.chromium.org/865943007
