[ios] Adds the LogoVendor protocol.

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 29 matching lines @@
 namespace sync_sessions {
 class SyncedWindowDelegatesGetter;
 }
 
 namespace user_prefs {
 class PrefRegistrySyncable;
 }
 
 @protocol AppRatingPrompt;
 @protocol InfoBarViewProtocol;
+@protocol LogoVendor;
 @protocol TextFieldStyling;
 @class UITextField;
 @class UIView;
+@protocol UrlLoader;
 typedef UIView<InfoBarViewProtocol>* InfoBarViewPlaceholder;
 
 namespace ios {
 
 class ChromeBrowserProvider;
 class ChromeBrowserState;
 class ChromeIdentityService;
 class GeolocationUpdaterProvider;
 class SigninErrorProvider;
 class SigninResourcesProvider;
@@ skipping 81 matching lines @@
   // metrics_services_manager_client.h for details on |on_update_callback|.
   virtual bool IsSafeBrowsingEnabled(const base::Closure& on_update_callback);
 
   // Returns the list of available voice search languages.
   // TODO(rohitrao): Remove once callers are going through VoiceSearchProvider.
   virtual NSArray* GetAvailableVoiceSearchLanguages() const;
 
   // Returns an instance of the voice search provider, if one exists.
   virtual VoiceSearchProvider* GetVoiceSearchProvider() const;
 
+  // Creates and returns an object that can fetch and vend search engine logos.
+  // The caller assumes ownership of the returned object.
+  virtual id<LogoVendor> CreateLogoVendor(
+      ios::ChromeBrowserState* browser_state,
+      id<UrlLoader> loader) const NS_RETURNS_RETAINED;
+
   // Returns the SyncedWindowDelegatesGetter implementation.
   virtual std::unique_ptr<sync_sessions::SyncedWindowDelegatesGetter>
   CreateSyncedWindowDelegatesGetter(ios::ChromeBrowserState* browser_state);
 
   // TODO(rohitrao): This is a temporary method, used to prevent the tree from
   // breaking due to duplicate prefs registration.
   virtual bool ShouldEmbedderRegisterVoiceSearchPrefs() const;
 };
 
 }  // namespace ios
 
 #endif  // IOS_PUBLIC_PROVIDER_CHROME_BROWSER_CHROME_BROWSER_PROVIDER_H_