[SPv2] Paint accelerated canvases as foreign layers.

third_party/WebKit/Source/core/paint/StubChromeClientForSPv2.h

Index: third_party/WebKit/Source/core/paint/StubChromeClientForSPv2.h
diff --git a/third_party/WebKit/Source/core/paint/StubChromeClientForSPv2.h b/third_party/WebKit/Source/core/paint/StubChromeClientForSPv2.h
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+++ b/third_party/WebKit/Source/core/paint/StubChromeClientForSPv2.h
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+// Copyright 2016 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.
+
+#ifndef StubChromeClientForSPv2_h
+#define StubChromeClientForSPv2_h
+
+#include "core/loader/EmptyClients.h"
+#include "platform/graphics/compositing/PaintArtifactCompositor.h"
+#include "platform/testing/WebLayerTreeViewImplForTesting.h"
+
+namespace blink {
+
+// A simple ChromeClient implementation which forwards painted artifacts to a
+// PaintArtifactCompositor attached to a testing WebLayerTreeView, and permits
+// simple analysis of the results.
+class StubChromeClientForSPv2 : public EmptyChromeClient {
+public:
+    StubChromeClientForSPv2(WebLayerTreeViewImplForTesting::LayerListPolicy layerListPolicy)
+        : m_layerTreeView(layerListPolicy)
+    {
+        m_layerTreeView.setRootLayer(*m_paintArtifactCompositor.getWebLayer());
+    }
+
+    bool hasLayer(const WebLayer& layer) { return m_layerTreeView.hasLayer(layer); }
+
+    // ChromeClient
+    void didPaint(const PaintArtifact& artifact) override
+    {
+        m_paintArtifactCompositor.update(artifact);
+    }
+
+private:
+    WebLayerTreeViewImplForTesting m_layerTreeView;
+    PaintArtifactCompositor m_paintArtifactCompositor;
+};
+
+} // namespace blink
+
+#endif // StubChromeClientForSPv2_h