Add integration tests for chrome.smartCardProviderPrivate requests

[ViktoriiaKovalova]

already merged CLs: #914, #919, #920, #928, #929

[ViktoriiaKovalova]

Other CLs that contributed to this: #946, #989, #996, #1001, #1004, #1007, #1008, #1010, #1011, #1012, #1036, #1016, #1031, #1038, #1066, #1067, #1069, #1073.