Remaining code for basic tile compression functionality.

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 82ae6fc27a0df0b1213c461589b572dc716111af..accd4058523cd489024bf039ef886dae425a4cad 100644
--- a/cc/layers/picture_layer_impl.cc
+++ b/cc/layers/picture_layer_impl.cc
@@ -638,6 +638,9 @@ ScopedTilePtr PictureLayerImpl::CreateTile(float contents_scale,
   if (!is_mask_)
     flags = Tile::USE_PICTURE_ANALYSIS;
 
+  if (contents_opaque())
+    flags |= Tile::IS_OPAQUE;
+
   return layer_tree_impl()->tile_manager()->CreateTile(
       content_rect.size(), content_rect, contents_scale, id(),
       layer_tree_impl()->source_frame_number(), flags);