Factor PaintArtifact out of DisplayItemList.

third_party/WebKit/Source/platform/graphics/paint/PaintArtifact.cpp

Index: third_party/WebKit/Source/platform/graphics/paint/PaintArtifact.cpp
diff --git a/third_party/WebKit/Source/platform/graphics/paint/PaintArtifact.cpp b/third_party/WebKit/Source/platform/graphics/paint/PaintArtifact.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..04d5ebdb1a386eeb486970471ccc9344fe8afcb9
--- /dev/null
+++ b/third_party/WebKit/Source/platform/graphics/paint/PaintArtifact.cpp
@@ -0,0 +1,56 @@
+// Copyright 2015 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/PaintArtifact.h"
+
+#include "platform/TraceEvent.h"
+
+namespace blink {
+
+PaintArtifact::PaintArtifact()
+    : m_displayItems(0)
+{
+}
+
+PaintArtifact::~PaintArtifact()
+{
+}
+
+void PaintArtifact::reset()
+{
+    m_displayItems.clear();
+    m_paintChunks.clear();
+}
+
+void PaintArtifact::update(DisplayItems& updatedDisplayItems, Vector<PaintChunk> updatedPaintChunks)
+{
+    // TODO(jbroman): This can be expressed more clearly once std::move is
+    // available.
+    m_displayItems.clear();
+    m_displayItems.swap(updatedDisplayItems);
+    m_paintChunks.swap(updatedPaintChunks);
+}
+
+size_t PaintArtifact::approximateUnsharedMemoryUsage() const
+{
+    return sizeof(*this) + m_displayItems.memoryUsageInBytes()
+        + m_paintChunks.capacity() * sizeof(m_paintChunks[0]);
+}
+
+void PaintArtifact::replay(GraphicsContext& graphicsContext) const
+{
+    TRACE_EVENT0("blink,benchmark", "PaintArtifact::replay");
+    for (const DisplayItem& displayItem : m_displayItems)
+        displayItem.replay(graphicsContext);
+}
+
+void PaintArtifact::appendToWebDisplayItemList(WebDisplayItemList* list) const
+{
+    TRACE_EVENT0("blink,benchmark", "PaintArtifact::appendToWebDisplayItemList");
+    for (const DisplayItem& displayItem : m_displayItems)
+        displayItem.appendToWebDisplayItemList(list);
+}
+
+} // namespace blink