cc: Make LayerTreeTests use a DelegatingRenderer and Display.

android_webview/browser/surfaces_instance.h

Index: android_webview/browser/surfaces_instance.h
diff --git a/android_webview/browser/surfaces_instance.h b/android_webview/browser/surfaces_instance.h
index eb01f71402add51d94beeb9907f7c5313efc5758..5dec3d8b227f3fe22be40c2c18fe9d2a62b84c69 100644
--- a/android_webview/browser/surfaces_instance.h
+++ b/android_webview/browser/surfaces_instance.h
@@ -61,6 +61,10 @@ class SurfacesInstance : public base::RefCounted<SurfacesInstance>,
   // cc::DisplayClient overrides.
   void DisplayOutputSurfaceLost() override {}
   void DisplaySetMemoryPolicy(const cc::ManagedMemoryPolicy& policy) override {}
+  void DisplayWillDrawAndSwap(
+      bool will_draw_and_swap,
+      const cc::RenderPassList& render_passes) override {}
+  void DisplayDidDrawAndSwap() override {}
 
   // cc::SurfaceFactoryClient implementation.
   void ReturnResources(const cc::ReturnedResourceArray& resources) override;