Print Preview: Making margin selection sticky (part 2/2)

chrome/browser/resources/print_preview/print_preview.js

Index: chrome/browser/resources/print_preview/print_preview.js
diff --git a/chrome/browser/resources/print_preview/print_preview.js b/chrome/browser/resources/print_preview/print_preview.js
index 04ffee4529118a18fcfe7092d53e3c59cca8957e..f552fa8f23e1ad2611c90f5ae2d7ac091a8db167 100644
--- a/chrome/browser/resources/print_preview/print_preview.js
+++ b/chrome/browser/resources/print_preview/print_preview.js
@@ -164,11 +164,30 @@ function onLoad() {
 
   previewArea.showLoadingAnimation();
   chrome.send('getInitiatorTabTitle');
-  chrome.send('getDefaultPrinter');
+  serializeRequests();
   chrome.send('getNumberFormatAndMeasurementSystem');
 }
 
 /**
+ * Serializes requests |getNumberFormatAndMeasurementSystem|,
+ * |getLastUsedMarginSettings| and |getDefaultPrinter|. It guarantees that
+ * responses to those requests will arrive in the order requested.
+ */
+function serializeRequests() {
+  print_preview.setNumberFormatAndMeasurementSystem =
+      function(numberFormat, measurementSystem) {
+        print_preview.MarginSettings.setNumberFormatAndMeasurementSystem(
+            numberFormat, measurementSystem);
+        chrome.send('getLastUsedMarginSettings');
+      };
+  print_preview.setLastUsedMargins = function (
+      lastUsedMarginType, lastUsedMargins) {
+    marginSettings.setLastUsedMargins(lastUsedMarginType, lastUsedMargins);
+    chrome.send('getDefaultPrinter');
+  };
+}
+
+/**
  * Disables the input elements in the sidebar.
  */
 function disableInputElementsInSidebar() {
@@ -283,7 +302,7 @@ function updateControlsWithSelectedPrinterCapabilities() {
     lastSelectedPrinterIndex = selectedIndex;
 
     // Regenerate the preview data based on selected printer settings.
-    setDefaultValuesAndRegeneratePreview(true);
+    setDefaultValuesAndRegeneratePreview(false);
   }
 }
 
@@ -303,7 +322,7 @@ function doUpdateCloudPrinterCapabilities(printer) {
   lastSelectedPrinterIndex = selectedIndex;
 
   // Regenerate the preview data based on selected printer settings.
-  setDefaultValuesAndRegeneratePreview(true);
+  setDefaultValuesAndRegeneratePreview(false);
 }
 
 /**
@@ -577,12 +596,8 @@ function fileSelectionCompleted() {
  * @param {string} printer Name of the default printer. Empty if none.
  * @param {string} cloudPrintData Cloud print related data to restore if
  *     the default printer is a cloud printer.
- * @param {number} lastUsedMarginsType Indicates the last used margins type
- *     (matches enum MarginType in printing/print_job_constants.h.
  */
-function setDefaultPrinter(printer_name, cloudPrintData, lastUsedMarginsType) {
-  // Setting the margin selection to the last used one.
-  marginSettings.setLastUsedMarginsType(lastUsedMarginsType);
+function setDefaultPrinter(printer_name, cloudPrintData) {
   // Add a placeholder value so the printer list looks valid.
   addDestinationListOption('', '', true, true, true);
   if (printer_name) {