Disables rAF for the printing.

src/display/api.js

@@ -740,6 +740,7 @@ var PDFPageProxy = (function PDFPageProxyClosure() {
                                                       this.commonObjs,
                                                       intentState.operatorList,
                                                       this.pageNumber);
+      internalRenderTask.useRequestAnimationFrame = renderingIntent !== 'print';
       if (!intentState.renderTasks) {
         intentState.renderTasks = [];
       }
@@ -1555,6 +1556,7 @@ var InternalRenderTask = (function InternalRenderTaskClosure() {
     this.running = false;
     this.graphicsReadyCallback = null;
     this.graphicsReady = false;
+    this.useRequestAnimationFrame = false;
     this.cancelled = false;
     this.capability = createPromiseCapability();
     this.task = new RenderTask(this);
@@ -1628,7 +1630,11 @@ var InternalRenderTask = (function InternalRenderTaskClosure() {
     },
 
     _scheduleNext: function InternalRenderTask__scheduleNext() {
-      window.requestAnimationFrame(this._nextBound);
+      if (this.useRequestAnimationFrame) {
+        window.requestAnimationFrame(this._nextBound);
+      } else {
+        Promise.resolve(undefined).then(this._nextBound);
+      }
     },
 
     _next: function InternalRenderTask__next() {