Add setting to isolate zoom changes by default.

chrome/test/data/webui/settings/zoom_levels_tests.js

Index: chrome/test/data/webui/settings/zoom_levels_tests.js
diff --git a/chrome/test/data/webui/settings/zoom_levels_tests.js b/chrome/test/data/webui/settings/zoom_levels_tests.js
index 82d79ff13f257abfcc75ce6f5b1de172e99e4c23..0486425d58c8c6e8484580e18ace4089bbe7373e 100644
--- a/chrome/test/data/webui/settings/zoom_levels_tests.js
+++ b/chrome/test/data/webui/settings/zoom_levels_tests.js
@@ -58,7 +58,11 @@ cr.define('zoom_levels', function() {
         PolymerTest.clearBody();
         testElement = document.createElement('zoom-levels');
         document.body.appendChild(testElement);
-        return browserProxy.whenCalled('fetchZoomLevels');
+
+        return Promise.all([
+          browserProxy.whenCalled('fetchZoomScope'),
+          browserProxy.whenCalled('fetchZoomLevels'),
+        ]);
       }
 
       /**
@@ -94,6 +98,41 @@ cr.define('zoom_levels', function() {
           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]);
+        });
+      });
     });
   }