cc: Stop testing occlusion by making awkward queries.

cc/test/test_occlusion_tracker.h

 // Copyright 2014 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.
 
 #ifndef CC_TEST_TEST_OCCLUSION_TRACKER_H_
 #define CC_TEST_TEST_OCCLUSION_TRACKER_H_
 
 #include "cc/layers/render_surface.h"
 #include "cc/layers/render_surface_impl.h"
 #include "cc/trees/occlusion_tracker.h"
@@ skipping 34 matching lines @@
   }
 
   void set_occlusion_from_outside_target(const SimpleEnclosedRegion& region) {
     OcclusionTracker<LayerType>::stack_.back().occlusion_from_outside_target =
         region;
   }
   void set_occlusion_from_inside_target(const SimpleEnclosedRegion& region) {
     OcclusionTracker<LayerType>::stack_.back().occlusion_from_inside_target =
         region;
   }
+
+  void set_occlusion_on_contributing_surface_from_outside_target(
+      const SimpleEnclosedRegion& region) {
+    size_t stack_size = OcclusionTracker<LayerType>::stack_.size();
+    DCHECK_GE(stack_size, 2u);
+    OcclusionTracker<LayerType>::stack_[stack_size - 2]
+        .occlusion_from_outside_target = region;
+  }
+  void set_occlusion_on_contributing_surface_from_inside_target(
+      const SimpleEnclosedRegion& region) {
+    size_t stack_size = OcclusionTracker<LayerType>::stack_.size();
+    DCHECK_GE(stack_size, 2u);
+    OcclusionTracker<LayerType>::stack_[stack_size - 2]
+        .occlusion_from_inside_target = region;
+  }
 };
 
 }  // namespace cc
 
 #endif  // CC_TEST_TEST_OCCLUSION_TRACKER_H_