[SPv2] Use foreign layer support to enable composited video.

third_party/WebKit/Source/platform/testing/WebLayerTreeViewImplForTesting.h

 // Copyright 2013 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 WebLayerTreeViewImplForTesting_h
 #define WebLayerTreeViewImplForTesting_h
 
 #include "cc/test/test_task_graph_runner.h"
 #include "cc/trees/layer_tree_host_client.h"
 #include "cc/trees/layer_tree_host_single_thread_client.h"
@@ skipping 10 matching lines @@
 class WebCompositorAnimationTimeline;
 class WebLayer;
 
 // Dummy WeblayerTeeView that does not support any actual compositing.
 class WebLayerTreeViewImplForTesting : public blink::WebLayerTreeView,
     public cc::LayerTreeHostClient,
     public cc::LayerTreeHostSingleThreadClient {
     WTF_MAKE_NONCOPYABLE(WebLayerTreeViewImplForTesting);
 public:
     WebLayerTreeViewImplForTesting();
+    enum LayerListPolicy { DontUseLayerLists, UseLayerLists };
+    explicit WebLayerTreeViewImplForTesting(LayerListPolicy);
     explicit WebLayerTreeViewImplForTesting(const cc::LayerTreeSettings&);
     ~WebLayerTreeViewImplForTesting() override;
 
     static cc::LayerTreeSettings defaultLayerTreeSettings();
     cc::LayerTreeHost* layerTreeHost() { return m_layerTreeHost.get(); }
+    bool hasLayer(const WebLayer&);
 
     // blink::WebLayerTreeView implementation.
     void setRootLayer(const blink::WebLayer&) override;
     void clearRootLayer() override;
     void attachCompositorAnimationTimeline(cc::AnimationTimeline*) override;
     void detachCompositorAnimationTimeline(cc::AnimationTimeline*) override;
     virtual void setViewportSize(const blink::WebSize& unusedDeprecated,
         const blink::WebSize& deviceViewportSize);
     void setViewportSize(const blink::WebSize&) override;
     void setDeviceScaleFactor(float) override;
@@ skipping 51 matching lines @@
     void DidAbortSwapBuffers() override {}
 
 private:
     cc::TestTaskGraphRunner m_taskGraphRunner;
     std::unique_ptr<cc::LayerTreeHost> m_layerTreeHost;
 };
 
 } // namespace blink
 
 #endif // WebLayerTreeViewImplForTesting_h