Add a flag to force suppression of the auth dialog.

Requires external/webkit change:
If8c6f22e8307e1e13b8f7ad29f79305ce24b3255

Requires packages/apps/Browser change:
Id901855830bbe17ede8a18293cff2bbc0aad4ba8

Bug: 5094761
Change-Id: Ida5708aad7cbe5633106e9ae2997c9231aaf95b8
2 files changed