Expand Issue Tracking docs to include triage, Chrome instructions

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2255133003
NOTRY=true
DOCS_PREVIEW= https://skia.org/?cl=2255133003

Review-Url: https://codereview.chromium.org/2255133003

site/user/issue-tracker.md

@@ -1,8 +1,28 @@
-Issue Tracker (bug database)
+Issue Tracking
-============================
+==============
 
-The Issue Tracker is the bug database where we track all defect reports and
+The Skia Issue Tracker
-feature requests.
+----------------------
+[Skia's Issue Tracker](https://bugs.chromium.org/p/skia/issues/list)
+(bug.skia.org or skbug.com) is the primary bug database where we track all defect
+reports and feature requests.
 
-You can find it at https://bugs.chromium.org/p/skia/issues/list or use shortcut
+When filing a new issue, please select the appropriate template, most likely
-[bug.skia.org](https://bug.skia.org). 
+"Defect report from user" or "Feature request".  Include an example
+[fiddle](https://fiddle.skia.org) or image.  All issues will be triaged by our
+program manager and assigned to the appropriate functional team.
+
+
+Skia issues in the Chromium Tracker
+-----------------------------------
+Skia bugs found in Chrome may be filed in the [Chromium Tracker](https://bugs.chromium.org/p/chromium/issues/list) (crbug.com).
+
+### Triage for Chromium developers
+  * To have an issue triaged by the Skia team, add `Component:Internals>Skia`.
+  * For problems related to Skia rolls where an obvious owner cannot be found in
+    the list of CLs, assign to the Skia Sheriff, listed at the top of 
+    [status.skia.org](https://status.skia.org) and as a reviewer on the roll CL.
+    * If the Sheriff cannot be assigned, cc them and assign the issue to hcm@.
+  * For GPU specific issues, add label `Hotlist-Ganesh`.
+  * For image encoding or decoding issues, add
+    `Component:Internals>Images>Codecs`.