Create a FakeTetherService, which stubs out TetherService for development.

chromeos/chromeos_switches.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.
 
 #ifndef CHROMEOS_CHROMEOS_SWITCHES_H_
 #define CHROMEOS_CHROMEOS_SWITCHES_H_
 
 #include "base/memory/memory_pressure_monitor_chromeos.h"
 #include "chromeos/chromeos_export.h"
 
@@ skipping 72 matching lines @@
 CHROMEOS_EXPORT extern const char kEnableChromeVoxArcSupport[];
 CHROMEOS_EXPORT extern const char kEnableConsumerKiosk[];
 CHROMEOS_EXPORT extern const char kEnableDataSaverPrompt[];
 CHROMEOS_EXPORT extern const char kEnableEncryptionMigration[];
 CHROMEOS_EXPORT extern const char kEnableExperimentalAccessibilityFeatures[];
 CHROMEOS_EXPORT extern const char kEnableExtensionAssetsSharing[];
 CHROMEOS_EXPORT extern const char kEnableFirstRunUITransitions[];
 CHROMEOS_EXPORT extern const char kEnableLockScreenApps[];
 CHROMEOS_EXPORT extern const char kEnableKioskMode[];
 CHROMEOS_EXPORT extern const char kEnableTether[];
+CHROMEOS_EXPORT extern const char kTetherStub[];
 CHROMEOS_EXPORT extern const char kDisableMdOobe[];
 CHROMEOS_EXPORT extern const char kEnableNetworkPortalNotification[];
 CHROMEOS_EXPORT extern const char kEnablePhysicalKeyboardAutocorrect[];
 CHROMEOS_EXPORT extern const char kEnableRequestTabletSite[];
 CHROMEOS_EXPORT extern const char kEnableScreenshotTestingWithMode[];
 CHROMEOS_EXPORT extern const char kEnableTouchCalibrationSetting[];
 CHROMEOS_EXPORT extern const char kEnableTouchpadThreeFingerClick[];
 CHROMEOS_EXPORT extern const char kEnableTouchSupportForScreenMagnifier[];
 CHROMEOS_EXPORT extern const char kEnableVideoPlayerChromecastSupport[];
 CHROMEOS_EXPORT extern const char kEnableVoiceInteraction[];
@@ skipping 55 matching lines @@
 // Returns true if this is a Cellular First device.
 CHROMEOS_EXPORT bool IsCellularFirstDevice();
 
 // Returns true if voice interaction is enabled.
 CHROMEOS_EXPORT bool IsVoiceInteractionEnabled();
 
 }  // namespace switches
 }  // namespace chromeos
 
 #endif  // CHROMEOS_CHROMEOS_SWITCHES_H_