cc: Pass Occlusion instead of OcclusionTracker to LayerImpls

cc/layers/heads_up_display_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/append_quads_data.h"
 #include "cc/layers/heads_up_display_layer_impl.h"
 #include "cc/test/fake_impl_proxy.h"
 #include "cc/test/fake_layer_tree_host_impl.h"
 #include "cc/test/fake_output_surface.h"
-#include "cc/test/mock_occlusion_tracker.h"
 #include "cc/test/test_shared_bitmap_manager.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace cc {
 namespace {
 
 void CheckDrawLayer(HeadsUpDisplayLayerImpl* layer,
                     ResourceProvider* resource_provider,
                     DrawMode draw_mode) {
-  MockOcclusionTracker<LayerImpl> occlusion_tracker;
   scoped_ptr<RenderPass> render_pass = RenderPass::Create();
   AppendQuadsData data;
   bool will_draw = layer->WillDraw(draw_mode, resource_provider);
   if (will_draw)
-    layer->AppendQuads(render_pass.get(), occlusion_tracker, &data);
+    layer->AppendQuads(render_pass.get(), Occlusion(), &data);
   layer->UpdateHudTexture(draw_mode, resource_provider);
   if (will_draw)
     layer->DidDraw(resource_provider);
 
   size_t expected_quad_list_size = will_draw ? 1 : 0;
   EXPECT_EQ(expected_quad_list_size, render_pass->quad_list.size());
 }
 
 TEST(HeadsUpDisplayLayerImplTest, ResourcelessSoftwareDrawAfterResourceLoss) {
   FakeImplProxy proxy;
@@ skipping 13 matching lines @@
   layer->ReleaseResources();
 
   // Should skip resourceless software draw and not crash in UpdateHudTexture.
   CheckDrawLayer(layer.get(),
                  host_impl.resource_provider(),
                  DRAW_MODE_RESOURCELESS_SOFTWARE);
 }
 
 }  // namespace
 }  // namespace cc