Add type annotations to gallery/js/image_editor/image_view.js.

ui/file_manager/gallery/js/slide_mode.js

 // Copyright 2014 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.
 
 /**
  * Slide mode displays a single image and has a set of controls to navigate
  * between the images and to edit an image.
  *
  * @param {!HTMLElement} container Main container element.
  * @param {!HTMLElement} content Content container element.
@@ skipping 763 matching lines @@
     // in the cache longer.
     this.imageView_.prefetch(selectedItem);
   }
 
   function shouldPrefetch(loadType, step, sequenceLength) {
     // Never prefetch when selecting out of sequence.
     if (Math.abs(step) != 1)
       return false;
 
     // Always prefetch if the previous load was from cache.
-    if (loadType === ImageView.LOAD_TYPE_CACHED_FULL)
+    if (loadType === ImageView.LoadType.CACHED_FULL)
       return true;
 
     // Prefetch if we have been going in the same direction for long enough.
     return sequenceLength >= 3;
   }
 
   this.currentUniqueKey_++;
   var selectedUniqueKey = this.currentUniqueKey_;
 
   // Discard, since another load has been invoked after this one.
@@ skipping 179 matching lines @@
  * @param {number} delay Delay.
  * @param {*=} opt_error Error.
  * @private
  */
 SlideMode.prototype.itemLoaded_ = function(
     item, loadCallback, loadType, delay, opt_error) {
   var entry = item.getEntry();
   var metadata = item.getMetadata();
 
   this.showSpinner_(false);
-  if (loadType === ImageView.LOAD_TYPE_ERROR) {
+  if (loadType === ImageView.LoadType.ERROR) {
     // if we have a specific error, then display it
     if (opt_error) {
       this.errorBanner_.show(/** @type {string} */ (opt_error));
     } else {
       // otherwise try to infer general error
       this.errorBanner_.show('GALLERY_IMAGE_ERROR');
     }
-  } else if (loadType === ImageView.LOAD_TYPE_OFFLINE) {
+  } else if (loadType === ImageView.LoadType.OFFLINE) {
     this.errorBanner_.show('GALLERY_IMAGE_OFFLINE');
   }
 
   ImageUtil.metrics.recordUserAction(ImageUtil.getMetricName('View'));
 
   var toMillions = function(number) {
     return Math.round(number / (1000 * 1000));
   };
 
   ImageUtil.metrics.recordSmallCount(ImageUtil.getMetricName('Size.MB'),
@@ skipping 854 matching lines @@
   var event = assertInstanceof(event, MouseEvent);
   var viewport = this.slideMode_.getViewport();
   if (!this.enabled_ || !viewport.isZoomed())
     return;
   this.stopOperation();
   viewport.setOffset(
       viewport.getOffsetX() + event.wheelDeltaX,
       viewport.getOffsetY() + event.wheelDeltaY);
   this.slideMode_.applyViewportChange();
 };