tweaks to kythe indexing for Android Studio

-tool to generate vnames with googleplex-android corpus name
-uses root to map to the project name from manifest
-update vnames.json with that tool
-use tools/base/bazel/build_targets for targets to process
-add option to kythe build script to save entries to gcs
  this location will be used by code search to pick up data

Change-Id: I1627b221b7c4b146d1278d067abda8db329fec20
3 files changed