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

components/dom_distiller/core/javascript/dom_distiller_viewer.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.
 
 // This variable will be changed by iOS scripts.
 var distiller_on_ios = false;
 
+// This variable allows the page to signal the BrowserProcess
+// when the first bit of content is loaded.
+var navigate_on_initial_content_load = false;
+
+function setNavigateOnInitialContentLoad(navigate) {
+  navigate_on_initial_content_load = navigate;
+}
+
 function addToPage(html) {
   var div = document.createElement('div');
   div.innerHTML = html;
   document.getElementById('content').appendChild(div);
   fillYouTubePlaceholders();
+
+  if (navigate_on_initial_content_load) {
+    navigate_on_initial_content_load = false;
+    setTimeout(function() {
+        window.location = window.location + "#loaded";
+    }, 0);
+  }
 }
 
 function fillYouTubePlaceholders() {
   var placeholders = document.getElementsByClassName('embed-placeholder');
   for (var i = 0; i < placeholders.length; i++) {
     if (!placeholders[i].hasAttribute('data-type') ||
         placeholders[i].getAttribute('data-type') != 'youtube' ||
         !placeholders[i].hasAttribute('data-id')) {
       continue;
     }
@@ skipping 27 matching lines @@
   var collapse = document.getElementById('titleCollapse');
 
   collapse.style.height = "0px";
 
   holder.textContent = title;
   document.title = title;
   var newHeight = Math.max(90, holder.getBoundingClientRect().height);
 
   collapse.style.transition = "height 0.2s";
   collapse.style.height = newHeight + "px";
+
+  var mediaQuery = window.matchMedia("print");
+  mediaQuery.addListener(function (query) {
+    if (query.matches)
+      collapse.style.transition = '';
+  });
 }
 
 // Set the text direction of the document ('ltr', 'rtl', or 'auto').
 function setTextDirection(direction) {
   document.body.setAttribute('dir', direction);
 }
 
 // Maps JS Font Family to CSS class and then changes body class name.
 // CSS classes must agree with distilledpage.css.
 function useFontFamily(fontFamily) {
@@ skipping 56 matching lines @@
   // If the distiller is running on iOS, do not show the feedback form. This
   // variable is set in distiller_viewer.cc before this function is run.
   if (distiller_on_ios) return;
 
   document.getElementById('feedbackYes').innerText = yesText;
   document.getElementById('feedbackNo').innerText = noText;
   document.getElementById('feedbackQuestion').innerText = questionText;
 
   document.getElementById('contentWrap').style.paddingBottom = '120px';
   document.getElementById('feedbackContainer').style.display = 'block';
+  var mediaQuery = window.matchMedia("print");
+  mediaQuery.addListener(function (query) {
+    if (query.matches) {
+      document.getElementById('contentWrap').style.paddingBottom = '0px';
+      document.getElementById('feedbackContainer').style.display = 'none';
+    }
+  });
 }
 
 /**
  * Send feedback about this distilled article.
  * @param good True if the feedback was positive, false if negative.
  */
 function sendFeedback(good) {
   var img = document.createElement('img');
   if (good) {
     img.src = '/feedbackgood';
@@ skipping 231 matching lines @@
         shiftY: shiftY
       };
     }
   };
 }());
 
 window.addEventListener('touchstart', pincher.handleTouchStart, false);
 window.addEventListener('touchmove', pincher.handleTouchMove, false);
 window.addEventListener('touchend', pincher.handleTouchEnd, false);
 window.addEventListener('touchcancel', pincher.handleTouchCancel, false);