Don't cache reflection drawings

Source/platform/graphics/paint/DisplayItemList.h

Index: Source/platform/graphics/paint/DisplayItemList.h
diff --git a/Source/platform/graphics/paint/DisplayItemList.h b/Source/platform/graphics/paint/DisplayItemList.h
index 57a8074405c34b1d845002801560a3147516d1a6..319d7f5cd8f415b66a53f2d6f698d13689791902 100644
--- a/Source/platform/graphics/paint/DisplayItemList.h
+++ b/Source/platform/graphics/paint/DisplayItemList.h
@@ -35,6 +35,10 @@ public:
     void beginScope(DisplayItemClient);
     void endScope(DisplayItemClient);
 
+    void beginSkippingCache() { ++m_skippingCacheCount; }
+    void endSkippingCache() { ASSERT(m_skippingCacheCount > 0); --m_skippingCacheCount; }
+    bool skippingCache() const { return m_skippingCacheCount; }
+
     // Must be called when a painting is finished.
     void commitNewDisplayItems();
 
@@ -64,7 +68,8 @@ public:
 protected:
     DisplayItemList()
         : m_validlyCachedClientsDirty(false)
-        , m_constructionDisabled(false) { }
+        , m_constructionDisabled(false)
+        , m_skippingCacheCount(0) { }
 
 private:
     friend class DisplayItemListTest;
@@ -109,6 +114,8 @@ private:
     // in performance metrics.
     bool m_constructionDisabled;
 
+    int m_skippingCacheCount;
+
     // Scope ids are allocated per client to ensure that the ids are stable for non-invalidated
     // clients between frames, so that we can use the id to match new display items to cached
     // display items.