EventSender::KeyDown(): add "escape" and "backspace" key names.

..as their ASCII codes are used in various layout tests. Mapped to
VKEY_ESCAPE and VKEY_BACK, respectively.

[email protected]
BUG=392517

Review URL: https://codereview.chromium.org/488053002

Cr-Commit-Position: refs/heads/master@{#291110}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@291110 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed