Don't enter fullscreen on double click on bottom bar.

Fixes #2053

Change-Id: I4779547ae2116d9cc4394c27aab33366ad36a6a6

ui/controls.js

@@ -781,8 +781,13 @@ shaka.ui.Controls.prototype.addEventListeners_ = function() {
   // for focused elements.
   this.eventManager_.listen(window, 'keydown', this.onKeyDown_.bind(this));
 
-  this.eventManager_.listen(this.controlsContainer_, 'dblclick',
-      () => this.toggleFullScreen());
+  this.eventManager_.listen(
+      this.controlsContainer_, 'dblclick', () => this.toggleFullScreen());
+
+  // If double-clicking on the bottom bar, don't allow the click to propagate
+  // to toggle fullscreen above.
+  this.eventManager_.listen(
+      this.bottomControls_, 'dblclick', (e) => e.stopPropagation());
 
   this.eventManager_.listen(this.video_,
       'play', this.onPlayStateChange_.bind(this));