Add setting to isolate zoom changes by default.

chrome/test/data/webui/settings/zoom_levels_tests.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.
 
 /** @fileoverview Suite of tests for zoom-levels. */
 cr.define('zoom_levels', function() {
   function registerTests() {
     suite('ZoomLevels', function() {
       /**
        * A zoom levels category created before each test.
@@ skipping 40 matching lines @@
         testElement.remove();
         testElement = null;
       });
 
       /** @return {!Promise} */
       function initPage() {
         browserProxy.reset();
         PolymerTest.clearBody();
         testElement = document.createElement('zoom-levels');
         document.body.appendChild(testElement);
-        return browserProxy.whenCalled('fetchZoomLevels');
+
+        return Promise.all([
+          browserProxy.whenCalled('fetchZoomScope'),
+          browserProxy.whenCalled('fetchZoomLevels'),
+        ]);
       }
 
       /**
        * Fetch the remove button from the list.
        * @param {!HTMLElement} listContainer The list to use for the lookup.
        * @param {number} index The index of the child element (which site) to
        *     fetch.
        */
       function getRemoveButton(listContainer, index) {
         return listContainer.children[index].querySelector('paper-icon-button');
@@ skipping 15 matching lines @@
 
           var removeButton =
               getRemoveButton(testElement.$.listContainer, 0);
           assert(!!removeButton);
           MockInteractions.tap(removeButton);
           return browserProxy.whenCalled('removeZoomLevel');
         }).then(function(args) {
           assertEquals("http://www.google.com", args[0]);
         });
       });
+
+      test('toggle zoom scope', function() {
+        var toggle = testElement.$.toggle;
+        assertTrue(!!toggle);
+        assertTrue(toggle.checked);
+
+        MockInteractions.tap(toggle);
+        return browserProxy.whenCalled('setZoomScopeIsPerOrigin').then(
+            function(args) {
+          assertFalse(args[0]);
+        });
+      });
+
+      test('can remove entries while per-tab', function() {
+        browserProxy.setZoomScope(false);
+        browserProxy.setZoomList(zoomList);
+
+        return initPage().then(function() {
+          var toggle = testElement.$.toggle;
+          assertTrue(!!toggle);
+          assertFalse(toggle.checked);
+
+          var list = testElement.$.list;
+          assertTrue(!!list);
+          assertEquals(2, list.items.length);
+
+          var removeButton =
+              getRemoveButton(testElement.$.listContainer, 0);
+          assertTrue(!!removeButton);
+          MockInteractions.tap(removeButton);
+          return browserProxy.whenCalled('removeZoomLevel');
+        }).then(function(args) {
+          assertEquals("http://www.google.com", args[0]);
+        });
+      });
     });
   }
 
   return {
     registerTests: registerTests,
   };
 });