Add a "Simplify Page" option to the print preview dialog

chrome/browser/resources/print_preview/data/ticket_items/distill_page.js

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Copyright (c) 2015 The Chromium Authors. All rights reserved.

[Avi (use Gerrit), 2015/07/23 18:25:52]

For new files, remove the (c). One day we'll get around to removing the "(c)"
from all the old files.

 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 cr.define('print_preview.ticket_items', function() {
   'use strict';
 
   /**
    * Ticket item whose value is a {@code boolean} that represents whether to
-   * print selection only.
+   * distill the page before printing.
    * @param {!print_preview.DocumentInfo} documentInfo Information about the
    *     document to print.
+   * @param {!print_preview.SelectionOnly} selectionOnly Ticket definig whether
+   *     only selected content should be printed.
    * @constructor
    * @extends {print_preview.ticket_items.TicketItem}
    */
-  function SelectionOnly(documentInfo) {
+  function DistillPage(documentInfo, selectionOnly) {
     print_preview.ticket_items.TicketItem.call(
         this,
         null /*appState*/,
         null /*field*/,
         null /*destinationStore*/,
         documentInfo);
+
+    this.isAvailable_ = false;
+
+    this.selectionOnly_ = selectionOnly;
   };
 
-  SelectionOnly.prototype = {
+  DistillPage.prototype = {
     __proto__: print_preview.ticket_items.TicketItem.prototype,
 
     /** @override */
     wouldValueBeValid: function(value) {
       return true;
     },
 
     /** @override */
     isCapabilityAvailable: function() {
-      return this.getDocumentInfoInternal().isModifiable &&
-             this.getDocumentInfoInternal().hasSelection;
+      return this.isAvailable_;
     },
 
     /** @override */
     getDefaultValueInternal: function() {
       return false;
     },
 
     /** @override */
     getCapabilityNotAvailableValueInternal: function() {
       return false;
+    },
+
+    setIsCapabilityAvailable: function(isAvailable) {
+      if (this.isAvailable_ == isAvailable)
+        return;
+
+      this.isAvailable_ = isAvailable;
+      this.dispatchChangeEventInternal();
     }
   };
 
   // Export
   return {
-    SelectionOnly: SelectionOnly
+    DistillPage: DistillPage
   };
 });