First time using rebaseline-cl so I used --dry-run to see what would happen. Its output didn't include any actions. But running without --dry-run did cause some rebaselines to download. Seems like --dry-run should list what would be downloaded.

$ git cl issue
Issue number: 1195096 (https://chromium-review.googlesource.com/1195096)

# With --dry-run:

$ third_party/blink/tools/blink_tool.py rebaseline-cl --only-changed-tests --dry-run
2018-08-29 15:26:53,234 - Finished try jobs found for all try bots.
2018-08-29 15:27:30,768 - No retry summary available for "mac10.13_retina-blink-rel".
2018-08-29 15:27:31,237 - No retry summary available for "linux-blink-rel".
2018-08-29 15:27:31,774 - No retry summary available for "mac10.11-blink-rel".
2018-08-29 15:27:32,465 - No retry summary available for "mac10.10-blink-rel".
2018-08-29 15:27:33,114 - No retry summary available for "mac10.12-blink-rel".
2018-08-29 15:27:33,770 - No retry summary available for "win10-blink-rel".
2018-08-29 15:27:36,528 - No retry summary available for "win7-blink-rel".
2018-08-29 15:27:37,244 - No retry summary available for "mac10.13-blink-rel".

# No --dry-run, note last line:

$ third_party/blink/tools/blink_tool.py rebaseline-cl --only-changed-tests
2018-08-29 15:28:42,955 - Finished try jobs found for all try bots.
2018-08-29 15:29:01,334 - No retry summary available for "mac10.13_retina-blink-rel".
2018-08-29 15:29:02,789 - No retry summary available for "linux-blink-rel".
2018-08-29 15:29:03,441 - No retry summary available for "mac10.11-blink-rel".
2018-08-29 15:29:04,356 - No retry summary available for "mac10.10-blink-rel".
2018-08-29 15:29:05,225 - No retry summary available for "mac10.12-blink-rel".
2018-08-29 15:29:05,826 - No retry summary available for "win10-blink-rel".
2018-08-29 15:29:07,171 - No retry summary available for "win7-blink-rel".
2018-08-29 15:29:07,785 - No retry summary available for "mac10.13-blink-rel".
2018-08-29 15:29:08,906 - Rebaselining tables/mozilla/bugs/ bug14159 -1.html