Do not clip inside OcclusionTracker: Contributing Surfaces Edition.

cc/test/test_occlusion_tracker.h

Index: cc/test/test_occlusion_tracker.h
diff --git a/cc/test/test_occlusion_tracker.h b/cc/test/test_occlusion_tracker.h
index d62f8f686e2f93d5fdfd998d6cb646959978b84c..f244a2d8cfdde5d4ec4639c56d4b250c043e2ba0 100644
--- a/cc/test/test_occlusion_tracker.h
+++ b/cc/test/test_occlusion_tracker.h
@@ -27,6 +27,21 @@ class TestOcclusionTracker : public OcclusionTracker<LayerType> {
         .occlusion_from_outside_target;
   }
 
+  Region occlusion_on_contributing_surface_from_inside_target() const {
+    size_t stack_size = OcclusionTracker<LayerType>::stack_.size();
+    if (stack_size < 2)
+      return Region();
+    return OcclusionTracker<LayerType>::stack_[stack_size - 2]
+        .occlusion_from_inside_target;
+  }
+  Region occlusion_on_contributing_surface_from_outside_target() const {
+    size_t stack_size = OcclusionTracker<LayerType>::stack_.size();
+    if (stack_size < 2)
+      return Region();
+    return OcclusionTracker<LayerType>::stack_[stack_size - 2]
+        .occlusion_from_outside_target;
+  }
+
   void set_occlusion_from_outside_target(const Region& region) {
     OcclusionTracker<LayerType>::stack_.back().occlusion_from_outside_target =
         region;