Documentation for accessing the different repositories of SKPs

BUG=skia:2306
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1683233002
NOTRY=true
DOCS_PREVIEW= https://skia.org/?cl=1683233002

Review URL: https://codereview.chromium.org/1683233002

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+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)
+
+<a name="overview"></a>
+Overview
+--------
+
+An SKP is a binary representation of the draw commands Chromium sends to Skia for rasterization.
+
+Skia uses different types of SKPs in our continuous builds and tests:
+
+* [Buildbot](https://skia.org/dev/testing/buildbot) SKPs are the small set (89 as of 2/10/16) of SKPs that are used on almost all our bots.
+* [Cluster Telemetry](https://skia.org/dev/testing/ct) SKPs are the much larger set (~900k) that are used by our CT bots (Eg: [CT_BENCH_10k](https://build.chromium.org/p/client.skia/builders/Perf-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Release-CT_BENCH_10k_SKPs), [CT_DM_10k](https://build.chromium.org/p/client.skia/builders/Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Debug-CT_DM_10k_SKPs), [CT_DM_1m](https://build.chromium.org/p/client.skia.fyi/builders/Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Debug-CT_DM_1m_SKPs)).
+
+Skia developers find it useful to download these SKPs to run local tests to reproduce problems seen on the buildbots. The below sections detail how to download them.
+
+<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:
+
+* 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}
+
+
+<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, Mobile10k, 10k, Dummy1k)<br/>
+    $ CHROMIUM\_BUILD=... (Eg: 57259e0-05dcb4c)<br/>
+    $ SLAVE\_NUM=... (There are 100 available slaves)<br/>
+    $ gsutil -m cp gs://cluster-telemetry/skps/${REPO\_TYPE}/${CHROMIUM\_BUILD}/slave${SLAVE\_NUM}/*.skp ${SKP\_DEST}