Fix thumbnail view.

src/core.js

@@ -300,10 +300,6 @@ var Page = (function PageClosure() {
         items.push(item);
       }
       return items;
-    },
-    startRendering: function Page_startRendering(ctx, viewport,
-                                                 callback, textLayer)  {
-/// DELETE
     }
   };
 

web/viewer.js

@@ -1036,9 +1036,9 @@ var ThumbnailView = function thumbnailView(container, pdfPage, id) {
   this.id = id;
 
   var maxThumbSize = 134;
-  var canvasWidth = pageRatio >= 1 ? maxThumbSize :
+  var canvasWidth = this.width = pageRatio >= 1 ? maxThumbSize :
     maxThumbSize * pageRatio;
-  var canvasHeight = pageRatio <= 1 ? maxThumbSize :
+  var canvasHeight = this.height = pageRatio <= 1 ? maxThumbSize :
     maxThumbSize / pageRatio;
   var scaleX = this.scaleX = (canvasWidth / pageWidth);
   var scaleY = this.scaleY = (canvasHeight / pageHeight);
@@ -1083,11 +1083,18 @@ var ThumbnailView = function thumbnailView(container, pdfPage, id) {
 
     var ctx = getPageDrawContext();
     var drawViewport = pdfPage.getViewport(scaleX);
-    page.startRendering(ctx, drawViewport,
+    var renderContext = {
-      function thumbnailViewDrawStartRendering() {
+      canvasContext: ctx,
+      viewport: drawViewport
+    };
+    pdfPage.render(renderContext).then(
+      function pdfPageRenderCallback() {
         callback();
-      });
+      },
-
+      function pdfPageRenderError(error) {
+        callback();
+      }
+    );
     this.hasImage = true;
   };