[ios] Adds protocols for native app launching

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

Index: ios/public/provider/chrome/browser/chrome_browser_provider.h
diff --git a/ios/public/provider/chrome/browser/chrome_browser_provider.h b/ios/public/provider/chrome/browser/chrome_browser_provider.h
index 0f9f0467c917594e854bc50d092d56329b6955a5..014f611a64fb1d99cf8f96a7d113d9cad9d8c137 100644
--- a/ios/public/provider/chrome/browser/chrome_browser_provider.h
+++ b/ios/public/provider/chrome/browser/chrome_browser_provider.h
@@ -50,6 +50,7 @@ class PrefRegistrySyncable;
 @protocol InfoBarViewProtocol;
 @protocol LogoVendor;
 @protocol TextFieldStyling;
+@protocol NativeAppWhitelistManager;
 @class UITextField;
 @class UIView;
 @protocol UrlLoader;
@@ -170,6 +171,9 @@ class ChromeBrowserProvider {
   // TODO(rohitrao): This is a temporary method, used to prevent the tree from
   // breaking due to duplicate prefs registration.
   virtual bool ShouldEmbedderRegisterVoiceSearchPrefs() const;
+
+  // Returns the NativeAppWhitelistManager implementation.
+  virtual id<NativeAppWhitelistManager> GetNativeAppWhitelistManager() const;
 };
 
 }  // namespace ios