[Slimming Paint] Blink-side contiguous allocation of display items.

Source/platform/graphics/paint/SubtreeDisplayItem.cpp

Index: Source/platform/graphics/paint/SubtreeDisplayItem.cpp
diff --git a/Source/platform/graphics/paint/SubtreeDisplayItem.cpp b/Source/platform/graphics/paint/SubtreeDisplayItem.cpp
index bf1f849a1d26cdf8d53b1864aee7d937b34c3e5a..18b5e2482cf919ec04a181673d4aa479c6f3f9ca 100644
--- a/Source/platform/graphics/paint/SubtreeDisplayItem.cpp
+++ b/Source/platform/graphics/paint/SubtreeDisplayItem.cpp
@@ -5,4 +5,26 @@
 #include "config.h"
 #include "platform/graphics/paint/SubtreeDisplayItem.h"
 
-// Intentionally empty. Required when the create() functions are not inlined.
+#include "platform/graphics/paint/DisplayItems.h"
+
+namespace blink {
+
+void SubtreeCachedDisplayItem::appendByMoving(DisplayItems& destination)
+{
+    destination.emplaceBack<SubtreeCachedDisplayItem>(
+        DisplayItemClientWrapperHelper(*this), type());
+}
+
+void BeginSubtreeDisplayItem::appendByMoving(DisplayItems& destination)
+{
+    destination.emplaceBack<BeginSubtreeDisplayItem>(
+        DisplayItemClientWrapperHelper(*this), type());
+}
+
+void EndSubtreeDisplayItem::appendByMoving(DisplayItems& destination)
+{
+    destination.emplaceBack<EndSubtreeDisplayItem>(
+        DisplayItemClientWrapperHelper(*this), type());
+}
+
+} // namespace blink