cc: Make LayerTreeTests use a DelegatingRenderer and Display.

cc/surfaces/surface_display_output_surface.h

Index: cc/surfaces/surface_display_output_surface.h
diff --git a/cc/surfaces/surface_display_output_surface.h b/cc/surfaces/surface_display_output_surface.h
index f1bd5ea3460e4be4bc94d4fe96a1d3b7acec5886..d5f2d9fb5e9153360dfe907d1bfc03a23b6d017e 100644
--- a/cc/surfaces/surface_display_output_surface.h
+++ b/cc/surfaces/surface_display_output_surface.h
@@ -55,9 +55,12 @@ class CC_SURFACES_EXPORT SurfaceDisplayOutputSurface
   // DisplayClient implementation.
   void DisplayOutputSurfaceLost() override;
   void DisplaySetMemoryPolicy(const ManagedMemoryPolicy& policy) override;
+  void DisplayWillDrawAndSwap(bool will_draw_and_swap,
+                              const RenderPassList& render_passes) override;
+  void DisplayDidDrawAndSwap() override;

[enne (OOO), 2016/08/02 17:23:40]

Also in a cut down in client functions sense, why does this need to be here?

Can TestDelegatingOutputSurface::DrawCallback do this and only do it for tests,
or do you also need to wait on swap for real?

[danakj, 2016/08/02 17:28:39]

We need to wait for swap for real to check on things the GLRenderer did, for
copy requests and stuff.

 
  private:
-  void SwapBuffersComplete();
+  void DidDrawCallback();
 
   // This class is only meant to be used on a single thread.
   base::ThreadChecker thread_checker_;