Refactor: configurable page rotation in print job

Determine the page rotation at the same place as where the page size is
determined. This allows us to implement custom print page rotation logic
in one place, in the future.

web/firefox_print_service.js

@@ -61,7 +61,7 @@
         var renderContext = {
           canvasContext: ctx,
           transform: [PRINT_UNITS, 0, 0, PRINT_UNITS, 0, 0],
-          viewport: pdfPage.getViewport(1),
+          viewport: pdfPage.getViewport(1, size.rotation),
           intent: 'print'
         };
         return pdfPage.render(renderContext).promise;

web/pdf_print_service.js

@@ -60,7 +60,7 @@
       var renderContext = {
         canvasContext: ctx,
         transform: [PRINT_UNITS, 0, 0, PRINT_UNITS, 0, 0],
-        viewport: pdfPage.getViewport(1),
+        viewport: pdfPage.getViewport(1, size.rotation),
         intent: 'print'
       };
       return pdfPage.render(renderContext).promise;

web/pdf_viewer.js

@@ -949,12 +949,16 @@ var PDFViewer = (function pdfViewer() {
 
     /**
      * Returns sizes of the pages.
-     * @returns {Array} Array of objects with width/height fields.
+     * @returns {Array} Array of objects with width/height/rotation fields.
      */
     getPagesOverview: function () {
       return this._pages.map(function (pageView) {
         var viewport = pageView.pdfPage.getViewport(1);
-        return {width: viewport.width, height: viewport.height};
+        return {
+          width: viewport.width,
+          height: viewport.height,
+          rotation: viewport.rotation,
+        };
       });
     },
   };