cc: Make LTHI::NotifyTileInitialized more generic.

cc/layers/picture_layer_impl.cc

Index: cc/layers/picture_layer_impl.cc
diff --git a/cc/layers/picture_layer_impl.cc b/cc/layers/picture_layer_impl.cc
index 8d08bbc48e123cdf15b2d350a226411eb5bb5adb..a61ed129884335c57cf8ad137a3b2394e3f86181 100644
--- a/cc/layers/picture_layer_impl.cc
+++ b/cc/layers/picture_layer_impl.cc
@@ -402,6 +402,14 @@ void PictureLayerImpl::UpdateTilePriorities() {
   layer_tree_impl()->DidModifyTilePriorities();
 }
 
+void PictureLayerImpl::NotifyTileInitialized(const Tile* tile) {
+  if (layer_tree_impl()->IsActiveTree()) {
+    gfx::RectF layer_damage_rect =
+        gfx::ScaleRect(tile->content_rect(), 1.f / tile->contents_scale());
+    AddDamageRect(layer_damage_rect);
+  }
+}
+
 void PictureLayerImpl::DidBecomeActive() {
   LayerImpl::DidBecomeActive();
   tilings_->DidBecomeActive();