GitLab

Add a new method SetUserPermission() to set the user's permission for a file.
Check the permission in DeleteResource(), TrashResource(), UpdateResource() and InitiateUploadExistingFile().

This change doesn't cover:
- Permission check for the parent when adding/removing entries to a directory.
- Cases where the permission is changed while upload is in progress. (even not sure what happens in the production)

BUG=340933
TEST=unit_tests --gtest_filter="FakeDriveServiceTest.*"

Review URL: https://codereview.chromium.org/445793003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@288062 0039d316-1c4b-4281-b951-d872f2087c98