AX: Calendar Picker: Add a test for input[type=week].

This CL adds a test for Blink r182213 [1] and Chromium #295859 [2].

[1] http://src.chromium.org/viewvc/blink?view=revision&revision=182213
[2] https://crrev.com/4968e8da39022d26a07e57eef215612f21cbab10

BUG=123896

Review URL: https://codereview.chromium.org/592003002

git-svn-id: svn://svn.chromium.org/blink/trunk@182548 bbb929c8-8fbe-4397-9dbb-9b2b20218538