Add setting to isolate zoom changes by default.

chrome/browser/resources/settings/site_settings/site_settings_prefs_browser_proxy.js

Index: chrome/browser/resources/settings/site_settings/site_settings_prefs_browser_proxy.js
diff --git a/chrome/browser/resources/settings/site_settings/site_settings_prefs_browser_proxy.js b/chrome/browser/resources/settings/site_settings/site_settings_prefs_browser_proxy.js
index 651257799ea56235bdc92ae0301a28b2e7da055e..840c835abd2fc8eac5eb4d75e981b6911a7f6e3d 100644
--- a/chrome/browser/resources/settings/site_settings/site_settings_prefs_browser_proxy.js
+++ b/chrome/browser/resources/settings/site_settings/site_settings_prefs_browser_proxy.js
@@ -270,12 +270,24 @@ cr.define('settings', function() {
     updateIncognitoStatus: function() {},
 
     /**
+     * Fetches the zoom scope setting. Returns the result via
+     * onZoomScopeChanged.
+     */
+    fetchZoomScope: function() {},
+
+    /**
      * Fetches the currently defined zoom levels for sites. Returns the results
      * via onZoomLevelsChanged.
      */
     fetchZoomLevels: function() {},
 
     /**
+     * Sets whether the zoom scope is per-origin or per-tab.
+     * @param {boolean} zoomScopeIsPerOrigin The zoom scope setting.
+     */
+    setZoomScopeIsPerOrigin: function(zoomScopeIsPerOrigin) {},
+
+    /**
      * Removes a zoom levels for a given host.
      * @param {string} host The host to remove zoom levels for.
      */
@@ -408,11 +420,21 @@ cr.define('settings', function() {
     },
 
     /** @override */
+    fetchZoomScope: function() {
+      chrome.send('fetchZoomScope');
+    },
+
+    /** @override */
     fetchZoomLevels: function() {
       chrome.send('fetchZoomLevels');
     },
 
     /** @override */
+    setZoomScopeIsPerOrigin: function(zoomScopeIsPerOrigin) {
+      chrome.send('setZoomScopeIsPerOrigin', [zoomScopeIsPerOrigin]);
+    },
+
+    /** @override */
     removeZoomLevel: function(host) {
       chrome.send('removeZoomLevel', [host]);
     },