[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 4fddf0964bc5cb1a8fe403800582be8633e7d72b..c30ba8fe503ad2533394c35c30cdc690a96ff00a 100644
--- a/ios/public/provider/chrome/browser/chrome_browser_provider.h
+++ b/ios/public/provider/chrome/browser/chrome_browser_provider.h
@@ -51,6 +51,7 @@ class PrefRegistrySyncable;
 @protocol InfoBarViewProtocol;
 @protocol LogoVendor;
 @protocol TextFieldStyling;
+@protocol NativeAppWhitelistManager;
 @class UITextField;
 @class UIView;
 @protocol UrlLoader;
@@ -174,6 +175,9 @@ 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