continuation of: https://codereview.chromium.org/11664024
Moved it from chrome/trunk/src/build to depot_tools/

BUG=153360
TEST=two unittests included in tests/
For end-to-end testing, check out a large directory.  Run
find . -name .svn -prune -o -size +1000k -type f -print0 | upload_to_google_storage.py -b chrome-artifacts -0 -
(replacing chrome-artifacts with an upload-able bucket)
to test upload

run "find . -name .svn -prune -o -size +1000k -type f -print0 | xargs -0 rm" to remove the files uploaded.  Check that the large binary files have been removed

run "download_from_google_storage.py -r -d -b chrome-artifacts ." to download the files again.

Review URL: https://chromiumcodereview.appspot.com/12042069

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@187951 0039d316-1c4b-4281-b951-d872f2087c98