cc: Start using raster/eviction iterators in tile manager

cc/layers/picture_layer_impl.h

Index: cc/layers/picture_layer_impl.h
diff --git a/cc/layers/picture_layer_impl.h b/cc/layers/picture_layer_impl.h
index 9609ccf3e449f282ec504f6e35a1001d5a4a93cc..747efcbb1ba0d0bfc80e3cd5d7e2d5331879a8d9 100644
--- a/cc/layers/picture_layer_impl.h
+++ b/cc/layers/picture_layer_impl.h
@@ -137,6 +137,13 @@ class CC_EXPORT PictureLayerImpl
   WhichTree GetTree() const;
   bool IsOnActiveOrPendingTree() const;
   bool AllTilesRequiredForActivationAreReadyToDraw() const;
+  bool LayerRegisteredInTileManager() const {
+    return !layer_needs_to_register_itself_;
+  }
+
+  void SetLayerNeedsToRegisterItselfForTesting(bool needs_to_register) {
+    layer_needs_to_register_itself_ = needs_to_register;
+  }
 
  protected:
   friend class LayerRasterTileIterator;