Internals: throw an exception when page height or width is 0.

third_party/WebKit/Source/core/testing/Internals.idl

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  * Copyright (C) 2013 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 182 matching lines @@
 
     void evictAllResources();
 
     unsigned long numberOfLiveNodes();
     unsigned long numberOfLiveDocuments();
     DOMString dumpRefCountedInstanceCounts();
     sequence<DOMString> consoleMessageArgumentCounts(Document document);
     unsigned long[] setMemoryCacheCapacities(unsigned long minDeadBytes, unsigned long maxDeadBytes, unsigned long totalBytes);
 
     DOMString counterValue(Element element);
-    long pageNumber(Element element, optional float pageWidth, optional float pageHeight);
+    [RaisesException] long pageNumber(Element element, optional float pageWidth = 800, optional float pageHeight = 600);
     DOMString[] shortcutIconURLs(Document document);
     DOMString[] allIconURLs(Document document);
-    long numberOfPages(optional double pageWidthInPixels, optional double pageHeightInPixels);
+    [RaisesException] long numberOfPages(optional double pageWidthInPixels = 800, optional double pageHeightInPixels = 600);
     [RaisesException] DOMString pageProperty(DOMString propertyName, long pageNumber);
     [RaisesException] DOMString pageSizeAndMarginsInPixels(long pageIndex, long width, long height, long marginTop, long marginRight, long marginBottom, long marginLeft);
 
     [RaisesException] void setDeviceScaleFactor(float scaleFactor);
     [RaisesException] void setPageScaleFactor(float scaleFactor);
     [RaisesException] void setPageScaleFactorLimits(float minScaleFactor, float maxScaleFactor);
 
     [RaisesException] void setIsCursorVisible(Document document, boolean isVisible);
 
     double effectiveMediaVolume(HTMLMediaElement mediaElement);
@@ skipping 134 matching lines @@
     bool setScrollbarVisibilityInScrollableArea(Node node, boolean visible);
 
     void forceRestrictIFramePermissions();
     [RaisesException] double monotonicTimeToZeroBasedDocumentTime(double platformTime);
 
     void setMediaElementNetworkState(HTMLMediaElement element, long state);
 
     // TODO(liberato): remove once autoplay gesture override experiment concludes.
     void triggerAutoplayViewportCheck(HTMLMediaElement mediaElement);
 };