cc: Stop passing the occlusion explicitly to AppendQuads.

cc/layers/picture_image_layer_impl_unittest.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/layers/picture_image_layer_impl.h"
 
 #include "cc/layers/append_quads_data.h"
 #include "cc/quads/draw_quad.h"
 #include "cc/resources/tile_priority.h"
 #include "cc/test/fake_impl_proxy.h"
@@ skipping 131 matching lines @@
   EXPECT_EQ(1.f, active_layer->tilings()->tiling_at(0)->contents_scale());
 
   // Create resources for the tiles.
   host_impl_.tile_manager()->InitializeTilesWithResourcesForTesting(
       active_layer->tilings()->tiling_at(0)->AllTilesForTesting());
 
   // Draw.
   scoped_ptr<RenderPass> render_pass = RenderPass::Create();
   AppendQuadsData data;
   active_layer->WillDraw(DRAW_MODE_SOFTWARE, nullptr);
-  active_layer->AppendQuads(render_pass.get(), Occlusion(), &data);
+  active_layer->AppendQuads(render_pass.get(), &data);
   active_layer->DidDraw(nullptr);
 
   EXPECT_EQ(DrawQuad::TILED_CONTENT, render_pass->quad_list.front()->material);
 
   // Tiles are ready at correct scale, so should not set had_incomplete_tile.
   EXPECT_EQ(0, data.num_incomplete_tiles);
 }
 
 }  // namespace
 }  // namespace cc