Add the feature to retain the user gesture in the extension callback

chrome/browser/extensions/api/permissions/permissions_api.cc

Index: chrome/browser/extensions/api/permissions/permissions_api.cc
===================================================================
--- chrome/browser/extensions/api/permissions/permissions_api.cc	(revision 263023)
+++ chrome/browser/extensions/api/permissions/permissions_api.cc	(working copy)
@@ -129,6 +129,7 @@
   perms_updater.AddPermissions(GetExtension(), requested_permissions_.get());
 
   results_ = Request::Results::Create(true);
+  retain_user_gesture_ = true;
   SendResponse(true);
 
   Release();  // Balanced in RunImpl().
@@ -188,6 +189,7 @@
     PermissionsUpdater perms_updater(GetProfile());
     perms_updater.AddPermissions(GetExtension(), requested_permissions_.get());
     results_ = Request::Results::Create(true);
+    retain_user_gesture_ = true;

[not at google - send to devlin, 2014/04/10 21:19:33]

if we're re-using the user gesture token on the renderer do we even need this
"retain user gesture" stuff? can we just pass the user gesture bit back down
again?

     SendResponse(true);
     return true;
   }