Adds shortcut to toggle desktop sharing.

index.html

                     </a>
                     <a class="button icon-prezi" id="toolbar_button_prezi" data-container="body" data-toggle="popover" data-placement="bottom" data-i18n="[content]toolbar.prezi" content="Share Prezi"></a>
                     <a class="button icon-share-doc" id="toolbar_button_etherpad" data-container="body" data-toggle="popover" data-placement="bottom" content="Shared document" data-i18n="[content]toolbar.etherpad"></a>
-                    <a class="button icon-share-desktop" id="toolbar_button_desktopsharing" data-container="body" data-toggle="popover" data-placement="bottom" content="Share screen" data-i18n="[content]toolbar.sharescreen" style="display: none"></a>
+                    <a class="button icon-share-desktop" id="toolbar_button_desktopsharing" data-container="body" data-toggle="popover" data-placement="bottom" shortcut="toggleDesktopSharingPopover" content="Share screen" data-i18n="[content]toolbar.sharescreen" style="display: none"></a>
                     <a class="button icon-full-screen" id="toolbar_button_fullScreen" data-container="body" data-toggle="popover" data-placement="bottom" content="Enter / Exit Full Screen" data-i18n="[content]toolbar.fullscreen"></a>
                     <a class="button icon-telephone" id="toolbar_button_sip" data-container="body" data-toggle="popover" data-placement="bottom" content="Call SIP number" data-i18n="[content]toolbar.sip" style="display: none"></a>
                     <a class="button icon-dialpad" id="toolbar_button_dialpad" data-container="body" data-toggle="popover" data-placement="bottom" content="Open dialpad" data-i18n="[content]toolbar.dialpad" style="display: none"></a>

modules/keyboardshortcut/keyboardshortcut.js

             id: "toggleChatPopover",
             function: APP.UI.toggleChat
         },
+        68: {
+            character: "D",
+            id: "toggleDesktopSharingPopover",
+            function: APP.desktopsharing.toggleScreenSharing
+        },
         70: {
             character: "F",
             id: "filmstripPopover",