[gnome-flashback] Media keys support

[Balló György <ballogyor gmail com>]

Hi,

In order to support media keys and other keybindings that are not
handled my metacity, the following D-Bus interface needs to be
implemented within gnome-flashback, which is used by GSD's media keys
plugin:
https://git.gnome.org/browse/gnome-settings-daemon/tree/plugins/media-keys/org.gnome.ShellKeyGrabber.xml

The original bugzilla tasks:
https://bugzilla.gnome.org/show_bug.cgi?id=643111
https://bugzilla.gnome.org/show_bug.cgi?id=693016

I don't really know how should it work. We can probably reuse some
code from the old keygrabber:
https://git.gnome.org/browse/gnome-settings-daemon/commit/plugins/common/gsd-keygrab.c?id=66c975cd90736e32f20ffd36846301d68e7a08e7

Or maybe implement it within metacity:
https://git.gnome.org/browse/mutter/commit/?id=a39cabfadb1d160b284ca3a17fdbf4f9e7c6d42c

Alberts, could you look at this issue?

--
György Balló
Arch Linux Trusted User