Refactor the Photo Editor to enable new feature work

chrome/browser/resources/file_manager/js/media/util.js

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * A controller class detects mouse inactivity and hides "tool" elements.
  *
  * @param {Element} container The main DOM container.
  * @param {number} opt_timeout Hide timeout in ms.
+ * @param {function():boolean=} opt_toolsActive Function that returns |true|
+ *     if the tools are active and should not be hidden.
  * @constructor
  */
-function MouseInactivityWatcher(container, opt_timeout) {
+function MouseInactivityWatcher(container, opt_timeout, opt_toolsActive) {
   this.container_ = container;
   this.timeout_ = opt_timeout || MouseInactivityWatcher.DEFAULT_TIMEOUT;
+  this.toolsActive_ = opt_toolsActive || function() { return false };
 
   this.onTimeoutBound_ = this.onTimeout_.bind(this);
   this.timeoutID_ = null;
   this.mouseOverTool_ = false;
 
   this.container_.addEventListener('mousemove', this.onMouseMove_.bind(this));
 }
 
 /**
  * Default inactivity timeout.
@@ skipping 30 matching lines @@
     clearTimeout(this.timeoutID_);
     this.timeoutID_ = null;
   }
 };
 
 /**
  * Called when user activity has stopped. Re-starts the countdown.
  * @param {number} opt_timeout Timeout.
  */
 MouseInactivityWatcher.prototype.stopActivity = function(opt_timeout) {
-  if (this.mouseOverTool_)
+  if (this.mouseOverTool_ || this.toolsActive_())
     return;
 
   if (this.timeoutID_)
     clearTimeout(this.timeoutID_);
 
   this.timeoutID_ = setTimeout(
       this.onTimeoutBound_, opt_timeout || this.timeout_);
 };
 
 /**
@@ skipping 23 matching lines @@
 
   this.stopActivity();
 };
 
 /**
  * Timeout handler.
  * @private
  */
 MouseInactivityWatcher.prototype.onTimeout_ = function() {
   this.timeoutID_ = null;
-  this.showTools(false);
+  if (!this.toolsActive_())
+    this.showTools(false);
 };