[Themes] Update bundle declarations

Update bundle declarations to provide a THEME constant for
use in filtering out theme-specific CSS additions.

platform/commonUI/general/bundle.json

@@ -18,7 +18,7 @@
         "runs": [
             {
                 "implementation": "StyleSheetLoader.js",
-                "depends": [ "stylesheets[]", "$document" ]
+                "depends": [ "stylesheets[]", "$document", "THEME" ]
             }
         ],
         "stylesheets": [
@@ -194,6 +194,11 @@
             {
                 "key": "MCT_SCROLL_Y_ATTRIBUTE",
                 "value": "mctScrollY"
+            },
+            {
+                "key": "THEME",
+                "value": "unspecified",
+                "priority": "fallback"
             }
         ],
         "containers": [

platform/commonUI/themes/espresso/bundle.json

@@ -7,6 +7,12 @@
                 "stylesheetUrl": "css/theme-espresso.css",
                 "priority": 1000
             }
+        ],
+        "constants": [
+            {
+                "key": "THEME",
+                "value": "espresso"
+            }
         ]
     }
 }

platform/commonUI/themes/snow/bundle.json

@@ -1,5 +1,5 @@
 {
-  "name": "Sonw",
+    "name": "Snow",
     "description": "Snow theme: light and cool",
     "extensions": {
         "stylesheets": [
@@ -7,6 +7,12 @@
                 "stylesheetUrl": "css/theme-snow.css",
                 "priority": 1000
             }
+        ],
+        "constants": [
+            {
+                "key": "THEME",
+                "value": "snow"
+            }
         ]
     }
 }