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Introduce the main view for Keyboard Shortcut Viewer (KSV).

Changes:
1. //ui/chromeos/ksv/views/*: the main view and test.
2. Populate the KeyboardShortcutItem's |shortcut_key_codes|.

Bug: 768932
Test: KeyboardShortcutViewTest and open the view and load metadata.
Change-Id: Ibc90872fc38600c1d81a63a49ab223f902a49afa
Reviewed-on: https://chromium-review.googlesource.com/880161
Commit-Queue: Tao Wu <wutao@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532205}