Record permission prompt gesture metrics on Android.

chrome/browser/permissions/permission_infobar_delegate.h

Index: chrome/browser/permissions/permission_infobar_delegate.h
diff --git a/chrome/browser/permissions/permission_infobar_delegate.h b/chrome/browser/permissions/permission_infobar_delegate.h
index f8cf3811dce183079b6123bfa0a69e392d5fd86f..f3bd625ffc41be387b8bcf1686461f8d64778ad4 100644
--- a/chrome/browser/permissions/permission_infobar_delegate.h
+++ b/chrome/browser/permissions/permission_infobar_delegate.h
@@ -66,6 +66,8 @@ class PermissionInfoBarDelegate : public ConfirmInfoBarDelegate {
   void set_persist(bool persist) { persist_ = persist; }
   bool persist() const { return persist_; }
 
+  bool user_gesture() const { return user_gesture_; }
+
   // ConfirmInfoBarDelegate:
   bool Accept() override;
   bool Cancel() override;