[ios] Adds BrandedImageProvider and its associated image resources.

ios/chrome/browser/providers/chromium_browser_provider.h

 // Copyright 2016 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_CHROME_BROWSER_PROVIDERS_CHROMIUM_BROWSER_PROVIDER_H_
 #define IOS_CHROME_BROWSER_PROVIDERS_CHROMIUM_BROWSER_PROVIDER_H_
 
 #include "ios/public/provider/chrome/browser/chrome_browser_provider.h"
 
 class ChromiumBrowserProvider : public ios::ChromeBrowserProvider {
  public:
   ChromiumBrowserProvider();
   ~ChromiumBrowserProvider() override;
 
   // ChromeBrowserProvider implementation
   ios::SigninErrorProvider* GetSigninErrorProvider() override;
   ios::SigninResourcesProvider* GetSigninResourcesProvider() override;
   void SetChromeIdentityServiceForTesting(
       std::unique_ptr<ios::ChromeIdentityService> service) override;
   ios::ChromeIdentityService* GetChromeIdentityService() override;
   void InitializeCastService(id main_tab_model) const override;
   void AttachTabHelpers(web::WebState* web_state, id tab) const override;
   VoiceSearchProvider* GetVoiceSearchProvider() const override;
   id<LogoVendor> CreateLogoVendor(ios::ChromeBrowserState* browser_state,
                                   id<UrlLoader> loader) const override
       NS_RETURNS_RETAINED;
+  BrandedImageProvider* GetBrandedImageProvider() const override;
 
  private:
+  std::unique_ptr<BrandedImageProvider> branded_image_provider_;
   std::unique_ptr<ios::SigninErrorProvider> signin_error_provider_;
   std::unique_ptr<ios::SigninResourcesProvider> signin_resources_provider_;
   std::unique_ptr<ios::ChromeIdentityService> chrome_identity_service_;
   std::unique_ptr<VoiceSearchProvider> voice_search_provider_;
 };
 
 #endif  // IOS_CHROME_BROWSER_PROVIDERS_CHROMIUM_BROWSER_PROVIDER_H_