[chromium] Keydown event for 'shift+alt' returns win keycode instead of 'alt'

[chromium] Keydown event for 'shift+alt' returns win keycode instead of 'alt'
https://bugs.webkit.org/show_bug.cgi?id=111112

Patch by Chandra Shekar Vallala <brk376@motorola.com> on 2013-03-08
Reviewed by Tony Chang.

.:

Return windows keycode of Alt incase of GDK_META_L, GDK_META_R.

Try press Shift then alt key. The test passes if the shiftKey, altKey values
of JSKeyEvent are true and keycode/which is 18.

* ManualTests/shift-alt-key-event.html: Added.

Source/WebCore:

Return windows keycode of Alt incase of GDK_META_L, GDK_META_R. This matches
the firefox behaviour in linux platform.

Added Manual Test : ManualTests/shift-alt-key-event.html
Try press Shift then alt key. The test passes if the shiftKey, altKey values
of JSKeyEvent are true and keycode/which is 18.

* platform/chromium/KeyCodeConversionGtk.cpp:
(WebCore::windowsKeyCodeForKeyEvent):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@145276 268f45cc-cd09-0410-ab3c-d52691b4dbfc