When a RPC to a REST API endpoint with an anonymized URL info is timed,
also report that timing information through gr-reporting.
Because RPC timings are already logged with richer information that what
is reported, gr-reporting's report method gets an option to avoid
logging the report itself.
Change-Id: Ib5efbb72a6c97d8156f774e7baac9d19aa96d639
fb55f00f9a