Add systemproperties doc

Change-Id: Ie50af1417c801f158599966e0d071666f9f99268
diff --git a/plugin/CobaltPlugin.json b/plugin/CobaltPlugin.json
index 49583a2..ce9567b 100644
--- a/plugin/CobaltPlugin.json
+++ b/plugin/CobaltPlugin.json
@@ -8,6 +8,47 @@
     "description": "The Cobalt plugin provides web browsing functionality based on the Cobalt engine.",
     "version": "1.0"
   },
+  "definitions": {
+    "systemproperties": {
+      "description": "Configure some properties queried with Starboard System API",
+      "type": "object",
+      "required": [],
+      "properties": {
+        "modelname": {
+          "type": "string",
+          "description": "The production model number of the device"
+        },
+        "brandname": {
+          "type": "string",
+          "description": "The name of the brand under which the device is being sold"
+        },
+        "modelyear": {
+          "type": "string",
+          "description": "The year the device was launched"
+        },
+        "chipsetmodelnumber": {
+          "type": "string",
+          "description": "The full model number of the main platform chipset"
+        },
+        "firmwareversion": {
+          "type": "string",
+          "description": "The production firmware version number which the device is currently running"
+        },
+        "integratorname": {
+          "type": "string",
+          "description": "Original manufcature of the device"
+        },
+        "friendlyname": {
+          "type": "string",
+          "description": "A friendly name for this actual device"
+        },
+        "devicetype": {
+          "type": "string",
+          "description": "Type of the device. Possible values [SetTopBox, OverTheTopBox, TV]"
+        }
+      }
+    }
+  },
   "configuration": {
     "type": "object",
     "properties": {
@@ -30,6 +71,13 @@
           "autosuspenddelay": {
             "type": "number",
             "description": "Applicable when pre-loading. Number of seconds to wait before suspending the app"
+          },
+          "gstdebug": {
+            "type": "string",
+            "description": "Configure GST_DEBUG environment variable, default: 'gstplayer:4,2'"
+          },
+          "systemproperties": {
+            "$ref": "#/definitions/systemproperties"
           }
         }
       }
diff --git a/plugin/doc/CobaltPlugin.md b/plugin/doc/CobaltPlugin.md
index 37c2912..b9ff671 100644
--- a/plugin/doc/CobaltPlugin.md
+++ b/plugin/doc/CobaltPlugin.md
@@ -81,6 +81,16 @@
 | configuration?.language | string | <sup>*(optional)*</sup> POSIX-style Language(Locale) ID. Example: 'en_US' |
 | configuration?.preload | boolean | <sup>*(optional)*</sup> Enable pre-loading of application |
 | configuration?.autosuspenddelay | number | <sup>*(optional)*</sup> Applicable when pre-loading. Number of seconds to wait before suspending the app |
+| configuration?.gstdebug | string | <sup>*(optional)*</sup> Configure GST_DEBUG environment variable, default: 'gstplayer:4,2' |
+| configuration?.systemproperties | object | <sup>*(optional)*</sup> Configure some properties queried with Starboard System API |
+| configuration?.systemproperties?.modelname | string | <sup>*(optional)*</sup> The production model number of the device |
+| configuration?.systemproperties?.brandname | string | <sup>*(optional)*</sup> The name of the brand under which the device is being sold |
+| configuration?.systemproperties?.modelyear | string | <sup>*(optional)*</sup> The year the device was launched |
+| configuration?.systemproperties?.chipsetmodelnumber | string | <sup>*(optional)*</sup> The full model number of the main platform chipset |
+| configuration?.systemproperties?.firmwareversion | string | <sup>*(optional)*</sup> The production firmware version number which the device is currently running |
+| configuration?.systemproperties?.integratorname | string | <sup>*(optional)*</sup> Original manufcature of the device |
+| configuration?.systemproperties?.friendlyname | string | <sup>*(optional)*</sup> A friendly name for this actual device |
+| configuration?.systemproperties?.devicetype | string | <sup>*(optional)*</sup> Type of the device. Possible values [SetTopBox, OverTheTopBox, TV] |
 
 <a name="head.Methods"></a>
 # Methods