[Views] Update view API usage in adapter

Expect contexts, not simple objects, for view api. #1307

See https://github.com/nasa/openmct/issues/1126#issuecomment-248127507
for rationale.

src/adapter/controllers/AdaptedViewController.js

@@ -29,8 +29,9 @@ define([], function () {
             }
 
             var domainObject = legacyObject.useCapability('adapter');
-            var providers = openmct.mainViews.get(domainObject);
+            var context = { item: domainObject };
-            $scope.view = providers[0] && providers[0].view(domainObject);
+            var providers = openmct.mainViews.get(context);
+            $scope.view = providers[0] && providers[0].view(context);
         }
 
         $scope.$watch('domainObject', refresh);

src/adapter/policies/AdaptedViewPolicy.js

@@ -31,7 +31,8 @@ define([], function () {
     ) {
         if (view.key === 'adapted-view') {
             var domainObject = legacyObject.useCapability('adapter');
-            return this.openmct.mainViews.get(domainObject).length > 0;
+            var context = { item: domainObject };
+            return this.openmct.mainViews.get(context).length > 0;
         }
         return true;
     };

src/ui/ViewRegistry.js

@@ -34,13 +34,14 @@ define([], function () {
 
     /**
      * @private for platform-internal use
-     * @param {*} item the object to be viewed
+     * @param {module:openmct.Context} context the view's context,
+     *        which includes the item being viewed
      * @returns {module:openmct.ViewProvider[]} any providers
      *          which can provide views of this object
      */
-    ViewRegistry.prototype.get = function (item) {
+    ViewRegistry.prototype.get = function (context) {
         return this.providers.filter(function (provider) {
-            return provider.canView(item);
+            return provider.canView(context);
         });
     };
 
@@ -105,8 +106,8 @@ define([], function () {
      *
      * @method canView
      * @memberof module:openmct.ViewProvider#
-     * @param {module:openmct.DomainObject} domainObject the domain object
+     * @param {module:openmct.Context} context the view's context,
-     *        to be viewed
+     *        which includes the item being viewed
      * @returns {boolean} true if this domain object can be viewed using
      *          this provider
      */
@@ -122,7 +123,8 @@ define([], function () {
      *
      * @method view
      * @memberof module:openmct.ViewProvider#
-     * @param {*} object the object to be viewed
+     * @param {module:openmct.Context} context the view's context,
+     *        which includes the item being viewed
      * @returns {module:openmct.View} a view of this domain object
      */