feat: support fitToPageEnabled and scaleFactor (#20436)

* fix: support fitToPageEnabled and scaleFactor

Support fitToPageEnabled and scaleFactor in  `WebContents.printToPDF()`

* fix: change default value of scaleFactor

lib/browser/api/web-contents.js

@@ -82,7 +82,7 @@ const defaultPrintingSetting = {
   deviceName: 'Save as PDF',
   generateDraftData: true,
   fitToPageEnabled: false,
-  scaleFactor: 1,
+  scaleFactor: 100,
   dpiHorizontal: 72,
   dpiVertical: 72,
   rasterizePDF: false,
@@ -208,6 +208,12 @@ WebContents.prototype.printToPDF = function (options) {
   if (options.landscape) {
     printingSetting.landscape = options.landscape
   }
+  if (options.fitToPageEnabled) {
+    printingSetting.fitToPageEnabled = options.fitToPageEnabled
+  }
+  if (options.scaleFactor) {
+    printingSetting.scaleFactor = options.scaleFactor
+  }
   if (options.marginsType) {
     printingSetting.marginsType = options.marginsType
   }
@@ -242,7 +248,7 @@ WebContents.prototype.printToPDF = function (options) {
   }
 
   // Chromium expects this in a 0-100 range number, not as float
-  printingSetting.scaleFactor *= 100
+  printingSetting.scaleFactor = Math.ceil(printingSetting.scaleFactor) % 100
   if (features.isPrintingEnabled()) {
     return this._printToPDF(printingSetting)
   } else {