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

Source/platform/graphics/paint/DisplayItemTransformTreeBuilderTest.cpp

Index: Source/platform/graphics/paint/DisplayItemTransformTreeBuilderTest.cpp
diff --git a/Source/platform/graphics/paint/DisplayItemTransformTreeBuilderTest.cpp b/Source/platform/graphics/paint/DisplayItemTransformTreeBuilderTest.cpp
index aeff937d83552c99d243ce8be0cdf6f8749fd0f1..2f1e3e9c61bbc7aca1dac3d61f394a9547569cdd 100644
--- a/Source/platform/graphics/paint/DisplayItemTransformTreeBuilderTest.cpp
+++ b/Source/platform/graphics/paint/DisplayItemTransformTreeBuilderTest.cpp
@@ -8,6 +8,7 @@
 #include "platform/graphics/paint/DisplayItem.h"
 #include "platform/graphics/paint/DisplayItemClient.h"
 #include "platform/graphics/paint/DisplayItemTransformTree.h"
+#include "platform/graphics/paint/DisplayItems.h"
 #include "platform/graphics/paint/Transform3DDisplayItem.h"
 #include "platform/transforms/TransformTestHelper.h"
 #include "platform/transforms/TransformationMatrix.h"
@@ -27,8 +28,15 @@ struct DummyClient {
 class DummyDisplayItem : public DisplayItem {
 public:
     static PassOwnPtr<DummyDisplayItem> create(const DummyClient& client) { return adoptPtr(new DummyDisplayItem(client)); }
+    DummyDisplayItem(const DummyClient& client) : DisplayItem(client, DisplayItem::DrawingFirst), m_dummyClient(client) { }
+
+    void appendByMoving(DisplayItems& destination) override
+    {
+        destination.emplaceBack<DummyDisplayItem>(m_dummyClient);
+    }
+
 private:
-    DummyDisplayItem(const DummyClient& client) : DisplayItem(client, DisplayItem::DrawingFirst) { }
+    const DummyClient& m_dummyClient;
 };
 
 class DisplayItemTransformTreeBuilderTest : public ::testing::Test {