Change SKPs to new asset management format

site/dev/testing/skps.md

 Downloading SKPs
 ================
 
 ### Contents ###
 
 *   [Overview](#overview)
 *   [How to download SKPs](#download_skps)
     +   [Buildbot SKPs (for Googlers)](#buildbot_skps_googler)
     +   [Buildbot SKPs (for trusted partners)](#buildbot_skps_partners)
     +   [Cluster Telemetry SKPs (for Googlers)](#ct_skps_googler)
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 <a name="download_skps"></a>
 How to download SKPs
 --------------------
 
 <a name="buildbot_skps_googler"></a>
 ### Buildbot SKPs (for Googlers)
 
 The following will work only if you have a google.com account.
 
-All buildbot SKP files created by the RecreateSKPs bot are available in the Google Storage bucket gs://chromium-skia-gm, they can be copied over to your local directory like this:
+All buildbot SKP files created by the RecreateSKPs bot are available via the asset management scripts:
 
-* Download the gsutil tool https://developers.google.com/cloud/sdk/#Quick_Start.
-* Authenticate using your google.com credentials “gcloud auth login”
-* Get the current SKP version from https://skia.googlesource.com/skia/+/master/SKP_VERSION.
-* Run in your terminal:
-
-    $ SKP\_VERSION=...<br/>
-    $ SKP\_DEST=...<br/>
-    $ gsutil -m cp gs://chromium-skia-gm/playback\_${SKP\_VERSION}/skps/*.skp ${SKP\_DEST}
+    $ download_from_google_storage -s infra/bots/tools/luci-go/${PLATFORM}/cipd.sha1 --bucket chromium-luci
+    $ infra/bots/tools/luci-go/${PLATFORM}/cipd auth-login
+    $ infra/bots/assets/skp/download.py -t ${TARGET_DIR}
 
 
 <a name="buildbot_skps_partners"></a>
 ### Buildbot SKPs (for trusted partners)
 
 * Request access to the gs://chrome-partner-telemetry bucket by emailing telemetry@chromium.org ([example](https://groups.google.com/a/chromium.org/d/msg/telemetry/kSwcgH7KiYs/zwBwEZaadOIJ)).
 * Once approved you can download Skia's weekly refreshed buildbot SKPs from gs://chrome-partner-telemetry/skps
 
 
 <a name="ct_skps_googler"></a>
 ### Cluster Telemetry SKPs (for Googlers)
 
 The following will work only if you have a google.com account.
 
 * Download the gsutil tool https://developers.google.com/cloud/sdk/#Quick_Start.
 * Authenticate using your google.com credentials “gcloud auth login”
 * Look at the SKP Repository list [here](https://ct.skia.org/lua_script/) for all available SKPs.
 * Run in your terminal:
 
     $ SKP\_DEST=...<br/>
     $ REPO\_TYPE=... (Either All, 100k, Mobile10k, 10k, Dummy1k)<br/>
     $ CHROMIUM\_BUILD=... (Eg: fad657e-276e633)<br/>
     $ gsutil -m cp gs://cluster-telemetry/swarming/skps/${REPO\_TYPE}/${CHROMIUM\_BUILD}/{1..10}/*.skp ${SKP\_DEST}
 
 * Substitute the 1 and 10 above with the start and end ranks of the SKPs you want to copy locally.
 * If you are trying to find a particular SKP. Look for it in the CSV [here](https://pantheon.corp.google.com/m/cloudstorage/b/cluster-telemetry/o/csv/top-1m.csv) and then use that rank in the copy command.