SetNeedsRedraw directly when updating a visible tile.

cc/test/fake_picture_layer.h

Index: cc/test/fake_picture_layer.h
diff --git a/cc/test/fake_picture_layer.h b/cc/test/fake_picture_layer.h
index 7aa155e1d9a3cf7c8ee4ff9cbc91f3abd62eaaf7..eec712f9b559a545e57cc288b7d3f3fd56e370c7 100644
--- a/cc/test/fake_picture_layer.h
+++ b/cc/test/fake_picture_layer.h
@@ -10,6 +10,7 @@
 #include "cc/layers/picture_layer.h"
 
 namespace cc {
+class DelayedRasterTrigger;
 
 class FakePictureLayer : public PictureLayer {
  public:
@@ -39,14 +40,22 @@ class FakePictureLayer : public PictureLayer {
     return output_surface_created_count_;
   }
 
+  void SetUseDelayedRaster(DelayedRasterTrigger* trigger) {
+    delayed_raster_trigger_ = trigger;
+  }
+
+ protected:
+  scoped_refptr<PicturePileImpl> CreatePicturePileImpl() override;
+
  private:
   explicit FakePictureLayer(ContentLayerClient* client);
   ~FakePictureLayer() override;
 
   size_t update_count_;
   size_t push_properties_count_;
-  bool always_update_resources_;
   size_t output_surface_created_count_;
+  bool always_update_resources_;
+  DelayedRasterTrigger* delayed_raster_trigger_;

[reveman, 2014/11/10 23:43:02]

Could this simply be a "base::WaitableEvent*
picture_pile_playback_is_allowed_to_complete_"? Or is the idea that
DelayedRasterTrigger would be able to do more like synthetic delays?

 };
 
 }  // namespace cc