Add a feature-controlled persistence checkbox to geolocation prompts on desktop Views platforms.

chrome/browser/permissions/permission_request_manager.h

Index: chrome/browser/permissions/permission_request_manager.h
diff --git a/chrome/browser/permissions/permission_request_manager.h b/chrome/browser/permissions/permission_request_manager.h
index b60dbb7a6310f81f41f4c616a43cc784966c56ab..def150e1a9606b7fe9b8f6fa147475115d17db07 100644
--- a/chrome/browser/permissions/permission_request_manager.h
+++ b/chrome/browser/permissions/permission_request_manager.h
@@ -125,6 +125,7 @@ class PermissionRequestManager
 
   // PermissionPrompt::Delegate:
   void ToggleAccept(int request_index, bool new_value) override;
+  void TogglePersist(bool new_value) override;
   void Accept() override;
   void Deny() override;
   void Closing() override;
@@ -186,6 +187,9 @@ class PermissionRequestManager
   GURL request_url_;
   bool main_frame_has_fully_loaded_;
 
+  // Whether the response to each request should be persisted.
+  bool persist_;
+
   // Whether each of the requests in |requests_| is accepted by the user.
   std::vector<bool> accept_states_;