Blink-side contiguous allocation of display items.

Source/platform/graphics/paint/DisplayItemListTest.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "platform/graphics/paint/DisplayItemList.h"
 
 #include "platform/RuntimeEnabledFeatures.h"
 #include "platform/graphics/GraphicsContext.h"
 #include "platform/graphics/paint/ClipRecorder.h"
+#include "platform/graphics/paint/DisplayItems.h"
 #include "platform/graphics/paint/DrawingDisplayItem.h"
 #include "platform/graphics/paint/DrawingRecorder.h"
 #include <gtest/gtest.h>
 
 namespace blink {
 
 class DisplayItemListTest : public ::testing::Test {
 public:
     DisplayItemListTest()
         : m_originalSlimmingPaintEnabled(RuntimeEnabledFeatures::slimmingPaintEnabled()) { }
@@ skipping 32 matching lines @@
 private:
     String m_name;
 };
 
 class TestDisplayItem : public DisplayItem {
 public:
     TestDisplayItem(const DisplayItemClientWrapper& client, Type type) : DisplayItem(client, type) { }
 
     virtual void replay(GraphicsContext&) override final { ASSERT_NOT_REACHED(); }
     virtual void appendToWebDisplayItemList(WebDisplayItemList*) const override final { ASSERT_NOT_REACHED(); }
+
+    void appendByMoving(DisplayItems& destination) override
+    {
+        destination.emplaceBack<TestDisplayItem>(
+            DisplayItemClientWrapperHelper(*this), type());
+    }
 };
 
 #ifndef NDEBUG
 #define TRACE_DISPLAY_ITEMS(i, expected, actual) \
     String trace = String::format("%d: ", (int)i) + "Expected: " + (expected).asDebugString() + " Actual: " + (actual).asDebugString(); \
     SCOPED_TRACE(trace.utf8().data());
 #else
 #define TRACE_DISPLAY_ITEMS(i, expected, actual)
 #endif
 
@@ skipping 567 matching lines @@
     EXPECT_DISPLAY_LIST(displayItemList().displayItems(), 4,
         TestDisplayItem(multicol, backgroundDrawingType),
         TestDisplayItem(content, foregroundDrawingType),
         TestDisplayItem(content, foregroundDrawingType),
         TestDisplayItem(content, foregroundDrawingType));
     EXPECT_NE(picture1, displayItemList().displayItems()[1].picture());
     EXPECT_NE(picture2, displayItemList().displayItems()[2].picture());
 }
 
 } // namespace blink