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Majority of the keyboard layouts use "Esc" or "esc" to present
"Escape". This cl adds special handling to display VKEY_ESCAPE
in Keyboard Shortcut Helper (KSV).

Bug: 821841
Test: manually tested.
Change-Id: I3b514325b5cc371c33c64973d0b0e3f9ee9548c6
Reviewed-on: https://chromium-review.googlesource.com/966872Reviewed-by: James Cook <jamescook@chromium.org>
Commit-Queue: Tao Wu <wutao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543857}