Paint invalidation tests for slimming paint v2

Source/core/testing/Internals.idl

Index: Source/core/testing/Internals.idl
diff --git a/Source/core/testing/Internals.idl b/Source/core/testing/Internals.idl
index 4b24aaf839bd080d0210ac3cb87fc1da0434dab6..62cb8a739d15ab051bfcb348d5037c090f61aa58 100644
--- a/Source/core/testing/Internals.idl
+++ b/Source/core/testing/Internals.idl
@@ -232,6 +232,7 @@
 
     // These functions both reset the tracked repaint rects. They are inteded 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);
 
@@ -242,6 +243,16 @@
 
     [RaisesException, TypeChecking=Interface] void forceFullRepaint(Document document);
 
+    // These functions both reset the tracked paint invalidation objects. They are inteded to be used in the following order:

[chrishtr, 2015/08/31 23:07:06]

s/inteded/intended/

[Xianzhu, 2015/08/31 23:17:56]

Done.

+    //  startTrackingPaintInvalidationObjects, trackedPaintInvalidationObjects, stopTrackingPaintInvalidationObjects.
+    void startTrackingPaintInvalidationObjects();
+    void stopTrackingPaintInvalidationObjects();
+
+    // Returns a list of debug strings for objects that were invalidated between
+    // startTrackingPaintInvalidationObjects and stopTrackingPaintInvalidationObjects.

[chrishtr, 2015/08/31 23:07:06]

Add parens at the end of the funciton names to make clear it's function calls,
not variables.

[Xianzhu, 2015/08/31 23:17:56]

Done.

+    // 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);