[KeyEvent Mac] Keypad Events have the wrong KeyboardCode

Fix Keypad keyboard events on Mac; so the KeyboardCodes reflect the Keypad location.

Ensure Keypad Events on Mac have the correct keycode associated with
them by avoiding the character conversion code and doing the
correct check based on the mac KeyCode value.

For example '0' as a Keypad character was producing the exact
same keycode as '0' as an alpha numeric key because it was
compared via the text conversion function first.

This code is taken from the WebInputEventFactory.mm in blink.

BUG=493833
Committed: https://crrev.com/90aa9cca7416ea267f38e59aded77c17ee10c0ec
Cr-Commit-Position: refs/heads/master@{#348798}

[dtapuska, 2015-09-14 18:08:08]

dtapuska@chromium.org changed reviewers:
+ wez@chromium.org

[Wez, 2015-09-14 21:59:53]

nit: The CL description is pretty tautogalous; the single line describes the
bug, the description describes the results of fixing it. Nothing describes _how_
it's being fixed. Looks like you're simply special-casing keypad keys to be
processed via the Mac keycode mapping table, rather than based on the character
output that they generate?

LGTM w/ a more complete CL description.

[dtapuska, 2015-09-15 00:37:26]

On 2015/09/14 21:59:53, Wez wrote:
> nit: The CL description is pretty tautogalous; the single line describes the
> bug, the description describes the results of fixing it. Nothing describes
_how_
> it's being fixed. Looks like you're simply special-casing keypad keys to be
> processed via the Mac keycode mapping table, rather than based on the
character
> output that they generate?
> 
> LGTM w/ a more complete CL description.

Ya sorry; I need to be more verbose...

[dtapuska, 2015-09-15 00:38:16]

The CQ bit was checked by dtapuska@chromium.org

[commit-bot: I haz the power, 2015-09-15 00:39:11]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1331383004/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1331383004/20001

[commit-bot: I haz the power, 2015-09-15 01:12:14]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-09-15 01:13:05]

Patchset 2 (id:??) landed as
https://crrev.com/90aa9cca7416ea267f38e59aded77c17ee10c0ec
Cr-Commit-Position: refs/heads/master@{#348798}

[commit-bot: I haz the power, 2015-09-23 12:40:39]

Patchset 2 (id:??) landed as
https://crrev.com/90aa9cca7416ea267f38e59aded77c17ee10c0ec
Cr-Commit-Position: refs/heads/master@{#348798}