cc: Clean up OcclusionTracker template parameters.

cc/test/occlusion_tracker_test_common.h

-// Copyright 2012 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_OCCLUSION_TRACKER_TEST_COMMON_H_
-#define CC_TEST_OCCLUSION_TRACKER_TEST_COMMON_H_
-
-#include "cc/layers/render_surface.h"
-#include "cc/layers/render_surface_impl.h"
-#include "cc/trees/occlusion_tracker.h"
-
-namespace cc {
-
-// A subclass to expose the total current occlusion.
-template <typename LayerType, typename RenderSurfaceType>
-class TestOcclusionTrackerBase
-    : public OcclusionTrackerBase<LayerType, RenderSurfaceType> {
- public:
-  TestOcclusionTrackerBase(const gfx::Rect& screen_scissor_rect,
-                           bool record_metrics_for_frame)
-      : OcclusionTrackerBase<LayerType, RenderSurfaceType>(
-            screen_scissor_rect,
-            record_metrics_for_frame) {}
-
-  Region occlusion_from_inside_target() const {
-    return OcclusionTrackerBase<LayerType, RenderSurfaceType>::stack_.back().
-        occlusion_from_inside_target;
-  }
-  Region occlusion_from_outside_target() const {
-    return OcclusionTrackerBase<LayerType, RenderSurfaceType>::stack_.back().
-        occlusion_from_outside_target;
-  }
-
-  void set_occlusion_from_outside_target(const Region& region) {
-    OcclusionTrackerBase<LayerType, RenderSurfaceType>::stack_.back().
-        occlusion_from_outside_target = region;
-  }
-  void set_occlusion_from_inside_target(const Region& region) {
-    OcclusionTrackerBase<LayerType, RenderSurfaceType>::stack_.back().
-        occlusion_from_inside_target = region;
-  }
-};
-
-typedef TestOcclusionTrackerBase<Layer, RenderSurface> TestOcclusionTracker;
-typedef TestOcclusionTrackerBase<LayerImpl, RenderSurfaceImpl>
-    TestOcclusionTrackerImpl;
-
-}  // namespace cc
-
-#endif  // CC_TEST_OCCLUSION_TRACKER_TEST_COMMON_H_