[Findit] Add cracas config in config page.

appengine/findit/model/crash/crash_config.py

Index: appengine/findit/model/crash/crash_config.py
diff --git a/appengine/findit/model/crash/crash_config.py b/appengine/findit/model/crash/crash_config.py
index e30dd68c95a0d061e67dde044f4e9deb2654f695..07ea30962fd9697eb472b1c6d28fbb3a2613d6ab 100644
--- a/appengine/findit/model/crash/crash_config.py
+++ b/appengine/findit/model/crash/crash_config.py
@@ -28,6 +28,15 @@ class CrashConfig(VersionedConfig):
   # }
   fracas = ndb.JsonProperty(indexed=False, default={})
 
+  # Cracas-specific parameters.
+  # {
+  #   "analysis_result_pubsub_topic": "projects/project-name/topics/name",
+  #   "supported_platform_list_by_channel": {
+  #     "canary": ["win", "mac"],

[mmandlis, 2016/09/20 17:33:56]

why is only "win" and "mac" supported? what is preventing us from enabling it
for other platforms?

[Sharu Jiang, 2016/09/20 18:02:57]

This comment is an example of what cracas config looks like, it's not exactly
the same as in config page. In config page, we will support:
    "canary": [
      "win",
      "mac",
      "android",
      "linux"
    ]

After some testing, we will enable other channels as well.

[stgao, 2016/09/20 18:07:12]

nit: make it clear that it is an example of the config.
Sorry for my bad sample above.

[Sharu Jiang, 2016/09/20 20:45:07]

Done.

+  #   },
+  # }
+  cracas = ndb.JsonProperty(indexed=False, default={})
+
   ################## Settings shared by Fracas/Clusterfuzz. ##################
   # Project classifier settings:
   # {