[SPv2] Build trivial cc property trees in PaintArtifactCompositor.

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

 // 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.
 
 #include "platform/testing/WebLayerTreeViewImplForTesting.h"
 
 #include "base/thread_task_runner_handle.h"
 #include "cc/animation/animation_host.h"
 #include "cc/animation/animation_timeline.h"
 #include "cc/blink/web_layer_impl.h"
 #include "cc/layers/layer.h"
 #include "cc/trees/layer_tree_host.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebLayer.h"
 #include "public/platform/WebLayerTreeView.h"
 #include "public/platform/WebSize.h"
 
 namespace blink {
 
 WebLayerTreeViewImplForTesting::WebLayerTreeViewImplForTesting()
+    : WebLayerTreeViewImplForTesting(defaultLayerTreeSettings())
 {
-    cc::LayerTreeSettings settings;
+}
 
-    // For web contents, layer transforms should scale up the contents of layers
-    // to keep content always crisp when possible.
-    settings.layer_transforms_should_scale_layer_contents = true;
-
+WebLayerTreeViewImplForTesting::WebLayerTreeViewImplForTesting(const cc::LayerTreeSettings& settings)
+{
     cc::LayerTreeHost::InitParams params;
     params.client = this;
     params.settings = &settings;
     params.main_task_runner = base::ThreadTaskRunnerHandle::Get();
     params.task_graph_runner = &m_taskGraphRunner;
     m_layerTreeHost = cc::LayerTreeHost::CreateSingleThreaded(this, &params);
     ASSERT(m_layerTreeHost);
 }
 
 WebLayerTreeViewImplForTesting::~WebLayerTreeViewImplForTesting() {}
 
+// static
+cc::LayerTreeSettings WebLayerTreeViewImplForTesting::defaultLayerTreeSettings()
+{
+    cc::LayerTreeSettings settings;
+
+    // For web contents, layer transforms should scale up the contents of layers
+    // to keep content always crisp when possible.
+    settings.layer_transforms_should_scale_layer_contents = true;
+
+    return settings;
+}
+
 void WebLayerTreeViewImplForTesting::setRootLayer(const blink::WebLayer& root)
 {
     m_layerTreeHost->SetRootLayer(static_cast<const cc_blink::WebLayerImpl*>(&root)->layer());
 }
 
 void WebLayerTreeViewImplForTesting::clearRootLayer()
 {
     m_layerTreeHost->SetRootLayer(scoped_refptr<cc::Layer>());
 }
 
@@ skipping 150 matching lines @@
 {
     m_layerTreeHost->SetHaveScrollEventHandlers(haveEentHandlers);
 }
 
 bool WebLayerTreeViewImplForTesting::haveScrollEventHandlers() const
 {
     return m_layerTreeHost->have_scroll_event_handlers();
 }
 
 } // namespace blink