Pre-scaling images to speed up feedback in Image Editor.

chrome/browser/resources/file_manager/js/image_editor/image_adjust.js

Index: chrome/browser/resources/file_manager/js/image_editor/image_adjust.js
diff --git a/chrome/browser/resources/file_manager/js/image_editor/image_adjust.js b/chrome/browser/resources/file_manager/js/image_editor/image_adjust.js
index f00e78dbf4225f5ae9a1a5f8e6626588384ea4a9..c47283f903424acba0c4cc03783d32bc2a36e6a4 100644
--- a/chrome/browser/resources/file_manager/js/image_editor/image_adjust.js
+++ b/chrome/browser/resources/file_manager/js/image_editor/image_adjust.js
@@ -15,21 +15,21 @@ ImageEditor.Mode.Adjust.prototype = {__proto__: ImageEditor.Mode.prototype};
 
 ImageEditor.Mode.Adjust.prototype.rollback = function() {
   if (!this.backup_) return; // Did not do anything yet.
-  this.getBuffer().drawImageData(this.backup_);
+  this.getContent().drawImageData(this.backup_, 0, 0);
   this.backup_ = null;
   this.repaint();
 };
 
 ImageEditor.Mode.Adjust.prototype.update = function(options) {
   if (!this.backup_) {
-    this.backup_ = this.getBuffer().copyImageData();
-    this.scratch_ = this.getBuffer().copyImageData();
+    this.backup_ = this.getContent().copyImageData();
+    this.scratch_ = this.getContent().copyImageData();
   }
 
   ImageUtil.trace.resetTimer('filter');
   this.filterFunc_(this.scratch_, this.backup_, options);
   ImageUtil.trace.reportTimer('filter');
-  this.getBuffer().drawImageData(this.scratch_);
+  this.getContent().drawImageData(this.scratch_, 0, 0);
   this.repaint();
 };