[MD Extensions] Add a details subpage, move to one list

chrome/browser/resources/md_extensions/item_list.js

Index: chrome/browser/resources/md_extensions/item_list.js
diff --git a/chrome/browser/resources/md_extensions/item_list.js b/chrome/browser/resources/md_extensions/item_list.js
index 2e6d9c3257d132c6d0ced6005adc3f1d862da7d7..724e8a4bda5a207c03f3d2454e3561b61e18491d 100644
--- a/chrome/browser/resources/md_extensions/item_list.js
+++ b/chrome/browser/resources/md_extensions/item_list.js
@@ -6,7 +6,22 @@ cr.define('extensions', function() {
   var ItemList = Polymer({
     is: 'extensions-item-list',
 
+    behaviors: [Polymer.NeonAnimatableBehavior],
+
     properties: {
+      animationConfig: {
+        type: Object,
+        value: function() {
+          return {
+            exit: [{
+              name: 'hero-animation',
+              id: 'hero',
+              fromPage: this,
+            }],
+          };
+        },
+      },
+
       /** @type {Array<!chrome.developerPrivate.ExtensionInfo>} */
       items: Array,
 
@@ -25,6 +40,7 @@ cr.define('extensions', function() {
 
     listeners: {
       'list.extension-item-size-changed': 'itemSizeChanged_',
+      'list.extension-item-will-show-details': 'itemWillShowDetails_',
     },
 
     /**
@@ -37,6 +53,10 @@ cr.define('extensions', function() {
       this.$.list.updateSizeForItem(e.detail.item);
     },
 
+    itemWillShowDetails_: function(e) {
+      this.sharedElements = { hero: e.detail.element };

[Devlin, 2016/04/23 01:50:11]

This could be more easily avoided if there was an iron-list "getElementForItem"
function, but I didn't see one when I was poking around...thoughts?

+    },
+
     /**
      * Computes the list of items to be shown.
      * @param {Object} changeRecord The changeRecord for |items|.