Add setting to isolate zoom changes by default.

chrome/common/pref_names.h

 // Copyright (c) 2012 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.
 
 // Constants for the names of various preferences, for easier changing.
 
 #ifndef CHROME_COMMON_PREF_NAMES_H_
 #define CHROME_COMMON_PREF_NAMES_H_
 
 #include <stddef.h>
@@ skipping 353 matching lines @@
 #endif
 #if defined(OS_LINUX) && !defined(OS_CHROMEOS)
 extern const char kUseCustomChromeFrame[];
 #endif
 extern const char kBackShortcutBubbleShownCount[];
 #if BUILDFLAG(ENABLE_PLUGINS)
 extern const char kContentSettingsPluginWhitelist[];
 #endif
 extern const char kPartitionDefaultZoomLevel[];
 extern const char kPartitionPerHostZoomLevels[];
+extern const char kPartitionDefaultZoomOriginScope[];
 
 #if !defined(OS_ANDROID)
 extern const char kPinnedTabs[];
 #endif
 
 extern const char kDisable3DAPIs[];
 extern const char kEnableDeprecatedWebPlatformFeatures[];
 extern const char kEnableHyperlinkAuditing[];
 extern const char kEnableReferrers[];
 extern const char kEnableDoNotTrack[];
@@ skipping 483 matching lines @@
 extern const char kSearchGeolocationDisclosureLastShowDate[];
 extern const char kSearchGeolocationPreDisclosureMetricsRecorded[];
 extern const char kSearchGeolocationPostDisclosureMetricsRecorded[];
 #endif
 
 extern const char kGoogleDSEGeolocationSetting[];
 
 }  // namespace prefs
 
 #endif  // CHROME_COMMON_PREF_NAMES_H_