Reland of: cc: Add occlusion checker as a fixed view of occlusion tracker.

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 66 matching lines @@
                                          float page_scale_factor,
                                          float maximum_animation_contents_scale,
                                          bool animating_transform_to_screen) {
     layer->draw_properties().ideal_contents_scale = ideal_contents_scale;
     layer->draw_properties().device_scale_factor = device_scale_factor;
     layer->draw_properties().page_scale_factor = page_scale_factor;
     layer->draw_properties().maximum_animation_contents_scale =
         maximum_animation_contents_scale;
     layer->draw_properties().screen_space_transform_is_animating =
         animating_transform_to_screen;
-    layer->UpdateTiles(NULL);
+    layer->UpdateTiles(Occlusion());
   }
 
  protected:
   FakeImplProxy proxy_;
   FakeLayerTreeHostImpl host_impl_;
   TestSharedBitmapManager shared_bitmap_manager_;
   FakePictureLayerTilingClient tiling_client_;
 };
 
 TEST_F(PictureImageLayerImplTest, CalculateContentsScale) {
@@ skipping 57 matching lines @@
   active_layer->DidDraw(NULL);
 
   EXPECT_EQ(DrawQuad::TILED_CONTENT, render_pass->quad_list[0]->material);
 
   // Tiles are ready at correct scale, so should not set had_incomplete_tile.
   EXPECT_EQ(0, data.num_incomplete_tiles);
 }
 
 }  // namespace
 }  // namespace cc