feat(ElementPanel): display scope properties for children of DocumentFragments

Sort of related to angular/angular.js#6637 --- Currently,
jqLite#inheritedData() will not find data if it needs to cross through document fragment
barriers, such as the Shadow DOM barrier. This patch allows batarang to figure this out.

In addition, it provides some tests for the angularjs properties sidebar of the element
panel, which were missing previously.

Closes angular#104

Author: caitp

js/devtoolsBackground.js

@@ -1,11 +1,23 @@
-var panels = chrome.devtools.panels;
+var panels = chrome && chrome.devtools && chrome.devtools.panels;
+
+function getScope(node) {
+  var scope = window.angular.element(node).scope();
+  if (!scope) {
+    // Might be a child of a DocumentFragment...
+    while (node && node.nodeType === 1) node = node.parentNode;
+    if (node && node.nodeType === 11) node = (node.parentNode || node.host);
+    return getScope(node);
+  }
+  return scope;
+}
 
 // The function below is executed in the context of the inspected page.
 
 var getPanelContents = function () {
   if (window.angular && $0) {
     //TODO: can we move this scope export into updateElementProperties
-    var scope = window.angular.element($0).scope();
+    var scope = getScope($0);
+
     // Export $scope to the console
     window.$scope = scope;
     return (function (scope) {
@@ -29,17 +41,19 @@ var getPanelContents = function () {
   }
 };
 
-panels.elements.createSidebarPane(
-  "AngularJS Properties",
-  function (sidebar) {
-    panels.elements.onSelectionChanged.addListener(function updateElementProperties() {
-      sidebar.setExpression("(" + getPanelContents.toString() + ")()");
+if (panels) {
+  panels.elements.createSidebarPane(
+    "AngularJS Properties",
+    function (sidebar) {
+      panels.elements.onSelectionChanged.addListener(function updateElementProperties() {
+        sidebar.setExpression("(" + getPanelContents.toString() + ")()");
+      });
     });
-  });
 
-// Angular panel
-var angularPanel = panels.create(
-  "AngularJS",
-  "img/angular.png",
-  "panel.html"
-);
+  // Angular panel
+  var angularPanel = panels.create(
+    "AngularJS",
+    "img/angular.png",
+    "panel.html"
+  );
+}

karma.conf

@@ -10,6 +10,7 @@ files = [
   'js/directives/*.js',
   'js/filters/*.js',
   'js/services/*.js',
+  'js/devtoolsBackground.js'
 
   'test/mock/*.js',
   'test/*.js'

karma.e2e.conf

@@ -10,6 +10,7 @@ files = [
   'js/directives/*.js',
   'js/filters/*.js',
   'js/services/*.js',
+  'js/devtoolsBackground.js',
 
   'test/mock/*.js',
   'test/*.js'

test/ElementsPanelSpec.js

@@ -0,0 +1,41 @@
+describe('elements panel', function() {
+  beforeEach(module(function($provide) {
+    $provide.factory('chromeExtension', createChromeExtensionMock);
+  }));
+
+  afterEach(function() {
+    $0 = null;
+  });
+
+
+  describe('angular properties sidebar', function() {
+    describe('getPanelContents()', function() {
+      it('should return properties for scope of selected element', inject(function($rootScope) {
+        var element = angular.element('<div><p>Hello, world</p></div>');
+        element.data('$scope', $rootScope);
+        $rootScope.text = "Hello, world!";
+        $0 = element[0];
+        expect (getPanelContents().text).toBe("Hello, world!");
+        $0 = element.children().eq(0)[0];
+        expect (getPanelContents().text).toBe("Hello, world!");
+      }));
+
+
+      it('should cross shadow DOM barrier via DocumentFragment#host', inject(function($rootScope) {
+        var parent = document.createElement('div'),
+            fragment = document.createDocumentFragment(),
+            child = document.createElement('p');
+        fragment.host = parent;
+        fragment.appendChild(child);
+        parent.appendChild(fragment);
+
+        parent = angular.element(parent);
+        parent.data('$scope', $rootScope);
+        $rootScope.text = "Fragmented fun for everyone";
+
+        $0 = child;
+        expect(getPanelContents().text).toBe("Fragmented fun for everyone");
+      }));
+    });
+  });
+});