Allow ChromeIdentityService in ChromeBrowserProvider to be overriden.

ios/public/provider/chrome/browser/chrome_browser_provider.h

 // Copyright 2013 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 IOS_PUBLIC_PROVIDER_CHROME_BROWSER_CHROME_BROWSER_PROVIDER_H_
 #define IOS_PUBLIC_PROVIDER_CHROME_BROWSER_CHROME_BROWSER_PROVIDER_H_
 
 #include <CoreGraphics/CoreGraphics.h>
 #import <Foundation/Foundation.h>
 #include <stddef.h>
@@ skipping 62 matching lines @@
   virtual void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
   // Returns an UpdatableResourceProvider instance.
   virtual UpdatableResourceProvider* GetUpdatableResourceProvider();
   // Returns an infobar view conforming to the InfoBarViewProtocol. The returned
   // object is retained.
   virtual InfoBarViewPlaceholder CreateInfoBarView(
       CGRect frame,
       InfoBarViewDelegate* delegate) NS_RETURNS_RETAINED;
   // Returns an instance of a signin resources provider.
   virtual SigninResourcesProvider* GetSigninResourcesProvider();
+  // Sets the current instance of Chrome identity service. Used for testing.
+  virtual void SetChromeIdentityServiceForTesting(
+      std::unique_ptr<ChromeIdentityService> service);
   // Returns an instance of a Chrome identity service.
   virtual ChromeIdentityService* GetChromeIdentityService();
   // Returns an instance of a LiveTabContextProvider.
   virtual LiveTabContextProvider* GetLiveTabContextProvider();
   virtual GeolocationUpdaterProvider* GetGeolocationUpdaterProvider();
   // Returns "enabled", "disabled", or "default".
   virtual std::string DataReductionProxyAvailability();
   // Returns the distribution brand code.
   virtual std::string GetDistributionBrandCode();
   // Sets the alpha property of an UIView with an animation.
@@ skipping 19 matching lines @@
   virtual bool IsSafeBrowsingEnabled(const base::Closure& on_update_callback);
 
   // Returns the SyncedWindowDelegatesGetter implementation.
   virtual std::unique_ptr<browser_sync::SyncedWindowDelegatesGetter>
   CreateSyncedWindowDelegatesGetter(ios::ChromeBrowserState* browser_state);
 };
 
 }  // namespace ios
 
 #endif  // IOS_PUBLIC_PROVIDER_CHROME_BROWSER_CHROME_BROWSER_PROVIDER_H_