Paint invalidation tests for slimming paint v2

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.
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     TypeConversions typeConversions();
 
     // This is enabled only in Debug builds.
     // This is because we want to avoid putting the byte stream of testing private scripts
     // into the binary of Release builds.
     PrivateScriptTest privateScriptTest();
 
     DOMString[] getReferencedFilePaths();
 
-    // These functions both reset the tracked repaint rects. They are inteded to be used in the following order:
-    //  startTrackingRepaints, repaintRectsAsText, stopTrackingRepaints.
+    // These functions both reset the tracked repaint rects. They are intended to be used in the following order:
+    //  startTrackingRepaints(), repaintRectsAsText(), stopTrackingRepaints().
+    // TODO(wangxianzhu): Remove these functions when we no longer use repaint rects.
     [RaisesException, TypeChecking=Interface] void startTrackingRepaints(Document document);
     [RaisesException, TypeChecking=Interface] void stopTrackingRepaints(Document document);
 
     // |node| should be Document, HTMLIFrameElement, or unspecified.
     // If |node| is an HTMLIFrameElement, it assumes node.contentDocument is
     // specified without security checks. Unspecified means this document.
     [RaisesException] void updateLayoutIgnorePendingStylesheetsAndRunPostLayoutTasks(optional Node? node = null);
 
     [RaisesException, TypeChecking=Interface] void forceFullRepaint(Document document);
 
+    // These functions both reset the tracked paint invalidation objects. They are intended to be used in the following order:
+    //  startTrackingPaintInvalidationObjects(), trackedPaintInvalidationObjects(), stopTrackingPaintInvalidationObjects().
+    void startTrackingPaintInvalidationObjects();
+    void stopTrackingPaintInvalidationObjects();
+
+    // Returns a list of debug strings for objects that were invalidated between
+    // startTrackingPaintInvalidationObjects() and stopTrackingPaintInvalidationObjects().
+    // If an object is invalidated multiple times, it will appear in the list multiple times.
+    DOMString[] trackedPaintInvalidationObjects();
+
     // Returns a list of draggable/non-draggable regions in the document.
     [RaisesException, TypeChecking=Interface] ClientRectList draggableRegions(Document document);
     [RaisesException, TypeChecking=Interface] ClientRectList nonDraggableRegions(Document document);
 
     // Returns a string with information about the mouse cursor used at the specified client location.
     [TypeChecking=Interface] DOMString getCurrentCursorInfo();
 
     readonly attribute boolean cursorUpdatePending;
 
     [TypeChecking=Interface] DOMString markerTextForListItem(Element element);
@@ skipping 72 matching lines @@
 
     ClientRectList outlineRects(Element element);
     void setCapsLockState(boolean enabled);
 
     // Returns whether the scrollbar was able to be shown or hidden; not all platforms
     // support overlay scrollbars.
     bool setScrollbarVisibilityInScrollableArea(Node node, boolean visible);
 
     void forceRestrictIFramePermissions();
 };