AutoDiscardable property support on Chrome Extensions Tabs API.

chrome/test/data/extensions/api_test/tabs/basics/discarding.js

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 var testTab;
 chrome.test.runTests([
 
     function setupWindow() {
       var testTabId;
 
       createWindow(["about:blank", "chrome://newtab/"], {},
                    pass(function(winId, tabIds) {
         testTabId = tabIds[1];
       }));
 
       waitForAllTabs(pass(function() {
         queryForTab(testTabId, {}, pass(function(tab) {
           testTab = tab;
         }));
       }));
     },
 
+    // Tests chrome.tabs.onUpdated for Discarded property.
     function discard() {
       // Initially tab isn't discarded.
       assertFalse(testTab.discarded);
 
       var onUpdatedCompleted = chrome.test.listenForever(
           chrome.tabs.onUpdated,
           function(tabId, changeInfo, tab) {
         if ('discarded' in changeInfo) {
           // Make sure it's the right tab.
           assertEq(testTab.index, tab.index);
@@ skipping 30 matching lines @@
 
         // Make sure the discarded state changed correctly.
         assertFalse(changeInfo.discarded);
         assertFalse(tab.discarded);
 
         onUpdatedCompleted();
       }
     });
 
     chrome.tabs.reload(testTab.id);
+  },
+
+  // Tests chrome.tabs.onUpdated for autoDiscardable property.
+  function setNonAutoDiscardable() {
+    // Initially the tab is auto-discardable.
+    assertTrue(testTab.autoDiscardable);
+
+    var onUpdatedCompleted = chrome.test.listenForever(
+        chrome.tabs.onUpdated,
+        function (tabId, changeInfo, tab) {

[Devlin, 2016/08/11 16:45:54]

nit: no space after function

[Anderson Silva, 2016/08/11 17:26:57]

Done.

+      if ('autoDiscardable' in changeInfo) {
+        // Make sure it's the right tab.
+        assertEq(testTab.id, tab.id);
+
+        // Make sure the auto-discardable state changed correctly.
+        assertFalse(changeInfo.autoDiscardable);
+        assertFalse(tab.autoDiscardable);
+
+        onUpdatedCompleted();
+      }
+    });
+
+    chrome.tabs.update(testTab.id, { autoDiscardable: false },
+                       pass(function (tab) {

[Devlin, 2016/08/11 16:45:54]

nit: no space after function

[Anderson Silva, 2016/08/11 17:26:57]

Done.

+      assertFalse(tab.autoDiscardable);
+      testTab = tab;
+    }));
+  },
+
+  function resetAutoDiscardable() {
+    // Tab was set to non auto-discardable.
+    assertFalse(testTab.autoDiscardable);
+
+    var onUpdatedCompleted = chrome.test.listenForever(
+        chrome.tabs.onUpdated,
+        function (tabId, changeInfo, tab) {

[Devlin, 2016/08/11 16:45:54]

ditto

[Anderson Silva, 2016/08/11 17:26:57]

Done.

+      if ('autoDiscardable' in changeInfo) {
+        // Make sure it's the right tab.
+        assertEq(testTab.id, tab.id);
+
+        // Make sure the auto-discardable state changed correctly.
+        assertTrue(changeInfo.autoDiscardable);
+        assertTrue(tab.autoDiscardable);
+
+        onUpdatedCompleted();
+      }
+    });
+
+    chrome.tabs.update(testTab.id, { autoDiscardable: true },
+                        pass(function (tab) {
+      assertTrue(tab.autoDiscardable);
+    }));
   }
 ]);