SPv2: Add support for tracking raster paint invalidations in testing.

third_party/WebKit/Source/platform/graphics/paint/PaintController.h

Index: third_party/WebKit/Source/platform/graphics/paint/PaintController.h
diff --git a/third_party/WebKit/Source/platform/graphics/paint/PaintController.h b/third_party/WebKit/Source/platform/graphics/paint/PaintController.h
index bc639bdc451a79cbaf1c2d8d75374a8a4aa4e1b0..db20539695d506f722eb0fa111421a788d36933d 100644
--- a/third_party/WebKit/Source/platform/graphics/paint/PaintController.h
+++ b/third_party/WebKit/Source/platform/graphics/paint/PaintController.h
@@ -159,6 +159,8 @@ public:
     void assertDisplayItemClientsAreLive();
 #endif
 
+    void setTracksPaintInvalidations(bool value) { m_isTrackingPaintInvalidations = value; }
+
 protected:
     PaintController()
         : m_newDisplayItemList(0)
@@ -169,6 +171,7 @@ protected:
         , m_skippingCacheCount(0)
         , m_numCachedNewItems(0)
         , m_currentCachedSubsequenceBeginIndexInNewList(kNotFound)
+        , m_isTrackingPaintInvalidations(false)
 #ifndef NDEBUG
         , m_numSequentialMatches(0)
         , m_numOutOfOrderMatches(0)
@@ -270,6 +273,7 @@ private:
     IndicesByClientMap m_outOfOrderChunkIndices;
 
     size_t m_currentCachedSubsequenceBeginIndexInNewList;
+    bool m_isTrackingPaintInvalidations;
     size_t m_nextChunkToMatch;
 
     DisplayItemClient::CacheGenerationOrInvalidationReason m_currentCacheGeneration;