Added the full screen button.

bigbluebutton-html5/app/client/stylesheets/whiteboard.less

@@ -66,6 +66,7 @@
 }
 
 #whiteboard-container {
+  position: relative; // makes the fullscreen button's absolute position work
   @media @landscape {
     display: -moz-flex;
     display: -ms-flexbox;
@@ -165,3 +166,16 @@
 #presentationProgress {
   font-size: 25px;
 }
+
+.whiteboardFullscreenButton {
+  position: absolute;
+  top: 0;
+  right: 0;
+  margin-bottom: 0;
+  &, &:hover {
+    background-color: transparent;
+  }
+  i {
+    color: black;
+  }
+}

bigbluebutton-html5/app/client/views/whiteboard/whiteboard.coffee

@@ -30,5 +30,5 @@ Template.whiteboard.events
   'click .switchSlideButton': (event) ->
     $('.tooltip').hide()
 
-  "click .fullscreenWhiteboardButton": (event, template) ->
+  "click .whiteboardFullscreenButton": (event, template) ->
     enterWhiteboardFullscreen()

bigbluebutton-html5/app/client/views/whiteboard/whiteboard.html

@@ -6,6 +6,7 @@
     <div id="whiteboard-container" class="{{whiteboardSize}}">
       <div id="whiteboard-paper">
       </div>
+      {{> makeButton btn_class="whiteboardFullscreenButton" i_class="ion-arrow-expand"}}
     </div>
     {{#if isCurrentUserPresenter}}
       <div id="controllers">