Use a cc::Display for layout tests.

content/renderer/gpu/render_widget_compositor.h

Index: content/renderer/gpu/render_widget_compositor.h
diff --git a/content/renderer/gpu/render_widget_compositor.h b/content/renderer/gpu/render_widget_compositor.h
index 6fdc804b3cf1e300642b1e75b6cdfce1b79d8990..68349ec2b9a32e57b40da8c439d932b2b618474a 100644
--- a/content/renderer/gpu/render_widget_compositor.h
+++ b/content/renderer/gpu/render_widget_compositor.h
@@ -24,8 +24,8 @@
 #include "third_party/WebKit/public/platform/WebLayerTreeView.h"
 #include "ui/gfx/geometry/rect.h"
 
-namespace ui {
-class LatencyInfo;
+namespace base {
+class CommandLine;
 }
 
 namespace cc {
@@ -33,11 +33,13 @@ class CopyOutputRequest;
 class InputHandler;
 class Layer;
 class LayerTreeHost;
-
 namespace proto {
 class CompositorMessage;
 }
+}
 
+namespace ui {
+class LatencyInfo;
 }
 
 namespace content {
@@ -59,6 +61,13 @@ class CONTENT_EXPORT RenderWidgetCompositor
 
   ~RenderWidgetCompositor() override;
 
+  static cc::LayerTreeSettings GenerateLayerTreeSettings(
+      const base::CommandLine& cmd,
+      CompositorDependencies* compositor_deps,
+      float device_scale_factor);
+  static cc::ManagedMemoryPolicy GetGpuMemoryPolicy(
+      const cc::ManagedMemoryPolicy& policy);
+
   void SetNeverVisible();
   const base::WeakPtr<cc::InputHandler>& GetInputHandler();
   bool BeginMainFrameRequested() const;
@@ -90,8 +99,6 @@ class CONTENT_EXPORT RenderWidgetCompositor
   bool SendMessageToMicroBenchmark(int id, std::unique_ptr<base::Value> value);
   void SetSurfaceIdNamespace(uint32_t surface_id_namespace);
   void OnHandleCompositorProto(const std::vector<uint8_t>& proto);
-  cc::ManagedMemoryPolicy GetGpuMemoryPolicy(
-      const cc::ManagedMemoryPolicy& policy);
   void SetPaintedDeviceScaleFactor(float device_scale);
 
   // WebLayerTreeView implementation.
@@ -207,6 +214,7 @@ class CONTENT_EXPORT RenderWidgetCompositor
   int num_failed_recreate_attempts_;
   RenderWidgetCompositorDelegate* const delegate_;
   CompositorDependencies* const compositor_deps_;
+  const bool threaded_;
   std::unique_ptr<cc::LayerTreeHost> layer_tree_host_;
   bool never_visible_;