Add wlr-keyboard-modifiers-unstable protocol

Signed-off-by: Harish Krupo <harish.krupo.kps@intel.com>

unstable/wlr-keyboard-modifiers-unstable-v1.xml

@@ -0,0 +1,54 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<protocol name="wlr_keyboard_modifiers_unstable_v1">
+  <copyright>
+    Copyright © 2018 Harish Krupo
+
+    Permission to use, copy, modify, distribute, and sell this
+    software and its documentation for any purpose is hereby granted
+    without fee, provided that the above copyright notice appear in
+    all copies and that both that copyright notice and this permission
+    notice appear in supporting documentation, and that the name of
+    the copyright holders not be used in advertising or publicity
+    pertaining to distribution of the software without specific,
+    written prior permission.  The copyright holders make no
+    representations about the suitability of this software for any
+    purpose.  It is provided "as is" without express or implied
+    warranty.
+
+    THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
+    SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+    FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
+    SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+    WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
+    AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
+    ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
+    THIS SOFTWARE.
+  </copyright>
+
+  <interface name="zwlr_keyboard_modifiers_v1" version="1">
+    <description summary="lets client recieve the keyboard modifiers">
+
+    </description>
+
+    <request name="get_keyboard_modifiers">
+      <description summary="request keyboard modifier events">
+        Keyboard modifier events would be sent to the client when need_events
+        is set to 1 and keyboard to the wl_keyboard for which the events are to
+        be sent. To stop receiving events, set need_events to 0 with keyboard
+        to NULL.
+        This is useful for application like status bar which want to show the
+        current keyboard layout.
+      </description>
+      <arg name="need_events" type="uint"/>
+      <arg name="keyboard" type="object" interface="wl_keyboard"
+           allow-null="true"/>
+    </request>
+
+    <request name="destroy" type="destructor">
+      <description summary="destroy the keyboard modifier object">
+        Destroy the object and stop receiving the modifier events.
+      </description>
+    </request>
+  </interface>
+</protocol>
+