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

components/dom_distiller/core/javascript/dom_distiller_viewer.js

Index: components/dom_distiller/core/javascript/dom_distiller_viewer.js
diff --git a/components/dom_distiller/core/javascript/dom_distiller_viewer.js b/components/dom_distiller/core/javascript/dom_distiller_viewer.js
index bf114cf6c9ad14639da53c4fef3a71e2e56ad27c..147efb6b4ff911c1cfa5d4173714069582ce1ca3 100644
--- a/components/dom_distiller/core/javascript/dom_distiller_viewer.js
+++ b/components/dom_distiller/core/javascript/dom_distiller_viewer.js
@@ -5,11 +5,26 @@
 // 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() {
@@ -57,6 +72,12 @@ function setTitle(title) {
 
   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').
@@ -133,6 +154,13 @@ function showFeedbackForm(questionText, yesText, noText) {
 
   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';
+    }
+  });
 }
 
 /**